You are developing a Windows Communication Foundation (WCF) client application.
You instantiate a client class that inherits from ClientBase. The client instance must always be shut down in such a way that it can free up any resources it is referencing. You need to ensure that all exceptions are caught and the instance is always properly shut
down.
Which code segment should you use?

• A. Option C
• B. Option D
• C. Option B
• D. Option A

A Windows Communication Foundation (WCF) solution uses the following contracts. (Line numbers are included for reference only.)

When the client calls GetMessage on the service interface, the service calls GetName on the client callback.
In the client, the class NameService implements the callback contract.
The client channel is created as follows.

You need to ensure that the service callback is processed by the instance of NameService.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

• A. Change line 25 to the following code segment.
  Dim factory As DuplexChannelFactory(Of IGreetingService) =
  New DuplexChannelFactory(Of IGreetingService)(
  callbackContext, binding, address)
• B. Add the following code segment after line 26.
  callbackContext.OutgoingChannels.Add(
  DirectCast(greetingService, IDuplexChannel))
• C. Add the following code segment after line 26.
  callbackContext.IncomingChannels.Add(
  DirectCast(greetingService, IDuplexChannel))
• D. Change line 26 to the following code segment.
  Dim greetingService As IGreetingService =
  factory.CreateChannel(callbackContext)

You are developing a Windows Communication Foundation (WCF) REST service to provide access to a library book catalog. The following code segment defines the service contract. (Line numbers are included for reference only.)

Library patrons want the ability to search the catalog by title.
You need to ensure that the GetBookByTitle method is exposed as a service method.
Which code segment should you insert at line 04?

• A. <WebGet(UciTemplate:-"Book/{titleToSeacch)")>
• B. <WebGet(UriTemplate:="Book/{title}")>
• C. <WebGet(UriTemplate:-"{titleToSearch}")>
• D. <WebGet(UriTemplate:="BookByTitle/{title)")>

A Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the ITimeService service interface in the TimeService class.
You need to configure the service endpoint for HTTP communication.
How should you define the service and endpoint tags?

• A. Define the service tag as follows.
  <service name=" TimeService ">
  Define the endpoint tag as follows.
  <endpoint address="http://localhost:8080/TimeService"
  binding=" wsHttpBinding "
  contract=" ITimeService "/ >
• B. Define the service tag as follows.
  <service name=" ITimeService ">
  Define the endpoint tag as follows.
  < endpoint name=" TimeService "
  address="http://localhost:8080/TimeService"
  binding=" wsHttpBinding "
  contract=" ITimeService "/ >
• C. Define the service tag as follows.
  <service name=" TimeService ">
  Define the endpoint tag as follows.
  < endpoint kind=" TimeService "
  address="http://localhost:8080/TimeService"
  binding=" wsHttpBinding "
  contract=" ITimeService " / >
• D. Define the service tag as follows.
  <service name=" ITimeService " >
  Define the endpoint tag as follows.
  < endpoint kind =" TimeService "
  address="http://localhost:8080/TimeService"
  binding=" wsHttpBinding "
  contract=" ITimeService"/ >

You are creating a Windows Communication Foundation (WCF) service that implements the following service contract.
[ServiceContract]
public interface IOrderProcessing
{
[OperationContract]
void ApproveOrder(int id);
}
You need to ensure that only users with the Manager role can call the ApproveOrder method.
What should you do?

• A. Add a PrincipalPermission attribute to the method and set the Roles property to Manager.
• B. In the method body, create a new instance of WindowsClaimSet. Use the FindClaims method to locate a claimType named Role with a right named Manager.
• C. Add a SecurityPermission attribute to the method and set the SecurityAction to Demand.
• D. In the method body, check the Rights.PossessProperty property to see if it contains Manager.