单项选择题 You are debugging a Windows Communication Foundation (WCF) service. The service uses signed and encrypted messages.You need to configure logging so that you can read the contents of the messages. What should you do?（）

单项选择题 You have a Windows Communication Foundation (WCF) service that accepts the following message contract.[MessageContract(WrapperNamespace="http://www.movies.com", ProtectionLevel=ProtectionLevel.None)] public class Ticket{ [MessageBodyMember(Namespace="http://www.movietheater.com", Order=1)] public DateTime ShowTime = DateTime.Now; [MessageBodyMember(Namespace="http://www.movietheater.com")] public string ReservationName = "Smith"; [MessageBodyMember(Namespace="http://www.movietheater.com")] public int NumberOfSeats = 0;} You need to ensure that the client sends a SOAP body that is accepted by the service.（）

单项选择题 You are creating an application that consumes a Windows Communication Foundation (WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.You need to ensure that a client proxy is created that can communicate with the service over a duplex channel. Which code segment should you use?（）