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单选题
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 OperationContractAttribute, set the AsyncPattern property value to True.

B

 On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client. For interactive and self-paced preparation of exam 70-513, try our practice exams. Practice exams also include self assessment and reporting features!

C

 On the client, create a proxy derived from DuplexClientBase(Of TChannel).

D

 On the client, use GetCallbackChannel(Of T).


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