You are developing a Windows Communication Foundation (WCF) service that contains the following operation contract.
[OperationContract]
CustomerNames GetCustomerNames();
The operation returns customer names.
You need to develop a definition for the operation contract that produces XML with the following structure.

Which code segment should you use?

• A. [DataMember(IsRequired = false)]
  public string[] Names;
  }
• B. [DataContract]
  public class CustomerNames
  {
  [DataMember]
  public string[] Names;
  }
• C. [MessageContract(WrapperName = "")]
  public class CustomerNames
  {
• D. [MessageBodyMember]
  public string[] Names;
  }
• E. [MessageContract(IsWrapped = false)]
  public class CustomerNames
  {
  [MessageBodyMember]
  public string[] Names;
  }
• F. [DataContract]
  public class CustomerNames
  {

A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Interface ITeamMessageService 03 04 <OperationContract()> 05 Function GetMessage() As String 06 07 <OperationContract()> 08 Sub PutMessage(ByVal message As String) 09 End Interface The code for the service class is as follows.
10 Public Class TeamMessageService 11 Implements ITeamMessageService 12 13 Dim key As Guid = Guid.NewGuid() 14 Dim message As String = "Today s Message" 15 16 Public Function GetMessage() As String _ 17 Implements ITeamMessageService.GetMessage 18 19 Return String.Format("Message:{0}. Key:{1}", message, key) 20 End Function 21 22 Public Sub PutMessage(ByVal message As String) _ 23 Implements ITeamMessageService.PutMessage 24 25 Me.message = message 26 End Sub 27 28 End Class
The service is self-hosted. The hosting code is as follows.
29 Dim host As ServiceHost = New ServiceHost(GetType(TeamMessageService)) 30 Dim binding As BasicHttpBinding = New BasicHttpBinding(BasicHttpSecurityMode.None)
31 host.AddServiceEndpoint(
"MyApplication.ITeamMessageService", binding,
"http://localhost:12345")
32 host.Open()
You need to ensure that all clients calling GetMessage will retrieve the updated string if the message is updated by any client calling PutMessage.
What should you do?

• A. Redefine the message string in line 14, as follows.
  Shared message As String = "Today s Message"
• B. Add the following attribute to the TeamMessageService class, before line 10002E
  <ServiceBehavior(InstanceContextMode:=
  InstanceContextMode.PerSession)>
• C. Add the following attribute to the TeamMessageService class, before line 10.
  <ServiceBehavior(InstanceContextMode:=InstanceContextMode.Single)>
• D. Then change the implementation of PutMessage in lines 22-26 to the following.
  Public Sub PutMessage(ByVal message As String) _
  Implements ITeamMessageService.PutMessage
  TeamMessageService.message = message
  End Sub
• E. Pass a service instance to the instancing code in line 29, as follows.
  Dim host As ServiceHost = New ServiceHost(New TeamMessageService())

A Windows Communication Foundation (WCF) service is required to log all authorization attempts to the Windows Event Log.
You need to configure a behavior and apply it to the service to support this requirement.
Which behavior should you configure and apply?

• A. serviceSecurityAudit
• B. serviceAuthenticationManager
• C. serviceCredentials
• D. serviceAuthorization

A Windows Communication Foundation (WCF) service implements the following contract. (Line numbers are included for reference only.)
01 [ServiceContract]
02 public interface IDataAccessService
03 {
01 [OperationContract]
05 void PutMessage(string message);
07 [OperationContract]
08 [FaultContract(typeof(TimeoutFaultException)) ]
09 [FaultContract(typeof(FaultException) ) ]
10 stringf] SearchMessages(string search);
11 }
The implementation of the SearchMessages method throws TimeoutFaultException exceptions for database timeouts. The implementation of the SearchMessages method also throws an Exception for any other issue it encounters while processing the request. These exceptions are received on the client side as generic FaultException exceptions.
You need to implement the error handling code for SearchMessages and create a new channel on the client only if the channel faults.
What should you do?

• A. Catch both TimeoutFaultException and FaultException. Create a new channel in both cases.
• B. Catch and handle TimeoutFaultException.Catch FaultException and create a new channel.
• C. Catch and handle FaultException.Catch TimeoutFaultException and create a new channel.
• D. Catch and handle both TimeoutFaultException and FaultException