You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.
<ServiceContract() > Public Interface IPaymentService <OperationContract() > Sub RecordPayments(ByVal person As Person) End Interface Public Class Person End Class Public Class Employee Inherits Person End Class Public Class Customer Inherits Person End Class
You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.
What should you do?

• A. Add the following KnownType attribute to the Employee class and to the Customer class. <KnownType(GetType(Person))>
• B. Implement the IExtension(Of T) interface in the Person class.
• C. Add the following KnownType attributes to the Person class. <KnownType(GetType(Employee))> <KnownType(GetType(Customer))>
• D. Implement the IExtensibleDataObject interface in the Person class.

A class named TestService implements the following interface.
[ServiceContract]
public interface lTestService {
[OperationContract]
DateTime GetServiceTime;
}
TestService is hosted in an ASP.NET application.
You need to modify the application to allow the GetServiceTime method to return the data formatted as JSON.
It must do this only when the request URL ends in /ServiceTime.
What should you do?

• A. Add this attribute to the GetServiceTime method
  [WebGet(
  ResponseFormat= WebMessageFormat.Json,
  UriTemplatee="/ServiceTime")]
  Create a new svc file named JsonVersion.svc with the following content.
  <%@ ServiceHost Service"TestService'
  Factorye="System.ServiceMode.ActivationWebServiceHostFactory" %>
• B. Add this attribute to the GetServiceTime method.
  [WebGet(UriTemplate = (Uson)/ServiceTime")]
  Create a new .svc file named Jsonversion svc with the following content
  <%@ ServiceHost Servicee"TestService"
  Factory="System ServiceModel.ActivationWebServiceHostFactory" %>
• C. Add this attribute to the GetServiceTime method.
  [Weblnvoke(MetMode"POST")]
  In the web.config file, add this element to
  system.serviceModel/behaviors/endpointBehaviors.
  <behavior namee"Json">
  <enableWebScript />
  </behavior>
  In the web.config file, configure TestService in the system.serviceModel/services collection
  as follows
  <service namez"TestService">
  <endpoint address"/ServiceTime"
  contracts"TestService"
  behaviorConfiguration="Json"
  bindingz"webHttpBinding" />
  </service>
• D. Add this attribute to the GetServiceTime method.
  [WebInvoke(Method = "GET',
  UriTemplate "/ServiceTime",
  ResponseFormat = WebMessageFormat.Json)]
  In the web.config file, configure TestService in the system.serviceModel/services collection
  as follows.
  <service namez"TestService">
  <endpoint address="/ServiceTime"
  contract="TestService"
  bindinge"webHttpBinding" />
  </service>

You develop a Windows Communication Foundation (WCF) service. You enable all
performance counters and run multiple calls to the service.
The service must isolate session data for each user.
You need to monitor the instancing behavior used in the service.
Which performance counter should you monitor?

• A. ServiceModelService 4.0.0.0\Instances
• B. ASP.NET State Service\State Server Sessions Total
• C. ServiceModelService 4.0.0.0\Calls
• D. ASP.NET State Service\State Server Sessions Active

You are developing a Windows Communication Foundation (WCF) service. The service needs to access out-of-process resources.
You need to ensure that the service accesses these resources on behalf of the originating caller.
What should you do?

• A. Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.
• B. Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.
• C. Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Impersonation.
• D. Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Delegation.