You are developing a Windows Communication Foundation (WCF) service.
One of the service operations contains the following code.
private static int counter = 0;
[OperationContract]
public void IncrementCount()
[
counter++;
}
You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

• A. [ServiceBehavior(
  InstanceContextMode = InstanceContextMode.Single,
  ConcurrencyMode = ConcurrencyMode.Hultiple)]
• B. [ServiceBehavior(
  InstanceContextMode = InstanceContextMode.Single,
  ConcurrencyMode = ConcurrencyMode.Single)]
• C. [ServiceBehavior(
  InstanceContextMode = InstanceContextMode.PerCall,
  ConcurrencyMode = ConcurrencyMode.Reentrant)]
• D. [ServiceBehavior(
  InstanceContextMode = InstanceContextMode.PerSession,
  ConcurrencyMode = ConcurrencyMode.Single)]

You are developing a new version of an existing message contract named CustomerDetailsVersion1.
The new version of the message contract must add a Department field of type String to the SOAP header.
You create a new class named CustomerDetailsVersion2 that inherits from CustomerDetailsVersion1.
You need to ensure that all client applications can consume the service.
Which code segment should you use?

• A. Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstond:"True)> Public Department As String End Class
• B. Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(MustUnderstand:=True)> Public Department As String End Class
• C. <MessageContract()> Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=True)> Public Department As String End Class
• D. Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=False) > Public Department As String End Class
• E. <MessageContract() > Public Class CustomerDetailsVersion2 Inherits CustomerDetailsVersionl <MessageHeader(HustUnderstand:=False)> Public Department As String End Class

You need to modify a client application that consumes a Windows Communication Foundation (WCF) service.
The service metadata is no longer available.
You need to modify the previously generated proxy to include asynchronous calls to the service.
What should you do?

• A. Create a class with the same name as the previously generated proxy and add the new asynchronous methods. Add the new class to a namespace that is different from the original proxy.
• B. Update the service reference with the Generate asynchronous operations option.
• C. Create a partial class for the previously generated proxy and include the new asynchronous methods.
• D. Create a class with the same name as the previously generated proxy and add the new asynchronous methods as partial methods. Add the new class to a namespace that is different from the original proxy.

You are using tracing to diagnose run-time issues when you look at the traces for the service in Svc Trace viewer exe, you see what is shown in the exhibit (Click the Exhibit button)

The exception trace is selected in Svc Trace reviewer exe.
You need to interpret the trace results to determine where the error occurred and what to do next.
What should you do?

• A. This issue occurred at the ServiceHost when accepting an initial set of messages from MSMQ.Log all messages sent between the clients and sever.
• B. This issue occurred in the Service Host during Service Host. Open. Compare the security settings for any endpoints that use an MSMQ transport to the security configuration of the MSMQ queue used by the endpoint
• C. This issue occurred in the ServiceHost during ServiceHost Open. Enable WMI by adding the following configuration to the system.serviceModel configuration section in the application configuration file <diagnostics wmiProviderEnabledetrue'!> Restart the application and inspect the endpoints visible through WMI
• D. This issue occurred at the Service Host when receiving a message Compare the security configurations on the client and server to make sure that they are compatible

Your Windows Communication Foundation (WCF) client application uses HTTP to communicate with the service.
You need to enable message logging and include all security information such as tokens and nonces in logged messages.
What should you do?

• A. In the machine configuration file, add the following XML segment to the
  system.serviceModel configuration section.
  <machineSettings enableLoggingKnownPii="true" />
  Generate the ContosoService class using the Add Service Reference wizard.
  Add the following code segment.
  Dim client As ContosoService = New ContosoService()
  client.Endpoint.Behaviors.Add(New CallbackDebugBehavior(True))
• B. In the application configuration file, add the following XML segment to the
  system.serviceModel configuration section group.
  <diagnostics>
  <messageLogging logMessagesAtTransportLevel="true"
  logEntireMessage="true" />
  </diagnostics>
• C. In the application configuration file, add the logKnownPii attribute to the message logging diagnostics source and set the value of the attribute to true.
  Generate the ContosoService class using the Add Service Reference wizard.
  Add a reference to System.ServiceModel.Routing.dll.
  Add the following code segment.
  Dim client As ContosoService = New ContosoService()
  Dim behavior As SoapProcessingBehavior = New SoapProcessingBe
  havior() behavior.ProcessMessages = True
  client.Endpoint.Behaviors.Add(behavior)
• D. In the machine configuration file, add the following XML segment to the
  system.serviceModel configuration section.
  <machineSettings enableLoggingKnownPii="true" />
  In the application configuration file, add the logKnownPii attribute to the message logging
  diagnostics source and set the value of the attribute to true.
  In the application configuration file, add the following XML segment to the
  system.serviceModel configuration section group.
  <diagnostics>
  <messageLogging logMessagesAtTransportLevel="true"/>
  </diagnostics>