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QUESTION 141
Drag and Drop Question
You create a Windows Communication Foundation (WCF) service. The service must be multi-threaded and maintain state across threads. You need to create the code for the service. Which code segments should you use? (To answer, drag the appropriate code segments to the correct location or locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

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QUESTION 21
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>.