You are developing a Windows Communication Foundation (WCF) service that contains the following code segment.
<ServiceContract()> Public Interface ICustomerService ... End Interface Public Class CustomerService Implements ICustomerService ... End Class
The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1. Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.
You need to ensure that any client application can access the service at either address.
Which code segment should you use?

• A. Dim serviceAddress1 As Uri =
  New Uri("http://contoso.com:8080/CustomerService/V1")
  Dim serviceAddress2 As Uri =
  New Uri("http://contoso.com:8080/CustomerService/V2")
  Dim host As ServiceHost =
  New Service Host(GetType(ICustomerService),
  New Uri() {serviceAddress1, serviceAddress2})
• B. Dim serviceAddress As Uri =
  New Uri("http://contoso.com:8080/")
  Dim host As ServiceHost =
  New Service Host(GetType(ICustomerService),
  New Uri() {serviceAddress})
  host.AddServiceEndpoint(GetType(CustomerService),
  New BasicHttpBinding(), "CustomerService/V1")
  host.AddServiceEnd point(GetType(CustomerService),
  New BasicHttpBinding(), "CustomerService/V2")
• C. Dim serviceAddress As Uri =
  New Uri("http://contoso.com:8080/")
  Dim host As ServiceHost =
  New Servic eHost(GetType(CustomerService),
  New Uri() {serviceAddress})
  host.AddServiceEndpoint(GetType(ICustomer Service),
  New BasicHttpBinding(), "CustomerService/V1")
  host.AddServiceEndp oint(GetType(ICustomerService),
  New BasicHttpBinding(), "CustomerService/V2")
• D. Dim serviceAddress1 As Uri =
  New Uri("http://contoso.com:8080/CustomerService/V1")
  Dim serviceAddress2 As Uri =
  New Uri("http://contoso.com:8080/CustomerService/V2")
  Dim host As ServiceHost =
  New ServiceHost(GetType(CustomerService),
  New Uri() {serviceAddress1, serviceAddress2})

A Windows Communication Foundation (WCF) service has a callback contract. You are developing a client application that will call this service.
You must ensure that the client application can interact with the WCF service.
What should you do?

• A. On the client, use GetCallbackChannel (Of T).
• B. On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
• C. On the client, create a proxy derived from DuplexClientBase(Of TChannel).
• D. On the OperationContractAttribute, set the AsyncPattern property value to True.

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

You are developing a Windows Communication Foundation (WCF) client application. The client application contains the following code.

The configuration file contains the following lines.

You need to ensure that the service is consumed.
Which code segment should you use?

• A. var client = new Social Client ("POST") ; client.Endpoint.Behaviors.Add( new WebHttpBehovior());
• B. var client = new SocialClient("SocialClient"); client.Endpoint.Behaviors.Add( new WebScriptEnoblingBehovior());
• C. var client = new Social Client ("POST"); client.Endpoint.Behaviors.Add( new WebScriptEnoblingBehovior());
• D. var client = new SocialClient("SocialClient"); c1lent.Endpoint.Behaviors.Add( new WebHttpBehovior());

You are creating a Windows Communication Foundation (WCF) service that responds using plain-old XML (POX).
You have the following requirements:
- You must enable the /catalog.svc/items operation to respond using the POX, JSON, or ATOM formats. You also must ensure that the same URL is used regardless of the result type.
- You must determine the response format by using the Accepts HTTP header.
What should you do?

• A. Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.
• B. Implement the IChannelInitializer interface in the service class.
• C. Set the return type of the operation to System.ServiceModel.Channels.Message. Use the current WebOperationContext methods to return the data in the required format.
• D. Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.