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?（）AOn the OperationContractAttribute, set the AsyncPattern property value to true.BOn the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.COn the client, create a proxy derived from DuplexClientBaseTChannel .DOn the client, use GetCallbackChannelT .
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.
C
On the client, create a proxy derived from DuplexClientBase<TChannel >.
D
On the client, use GetCallbackChannel<T >.
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