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单项选择题 You are developing a Windows Communication Foundation (WCF) service. The following code defines and implements the service. (Line numbers are included for reference only.) 01 [ServiceContract(SessionMode = SessionMode.Allowed)] 02 public interface ICatchAll 03 { 04 [OperationContract(IsOneWay = false, Action = "*", ReplyAction = "*")] 05 Message ProcessMessage(Message message); 06 } 07 08 public class CatchAllService : ICatchAll 09 { 10 public Message ProcessMessage(Message message) 11 { 12 13 ... 14 return returnMsg; 15 } 16 }You need to ensure that two identical copies of the received message are created in the service. Which code segment should you insert at line 12?（）

A、

B、

C、

D、

  • B

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