You are creating an application using Visual Studio 2010. The application consumes a Windows Communication Foundation (WCF) service.You are adding a service reference to the WCF service. You need to ensure that the generated proxy does not block the calling thread when executing a service method.What should you do when adding the service reference? （）A. Set the Collection type to ObservableCollection.B. Select the Reuse types in all referenced assemblies option.C. Select the Generate asynchronous operations option.D. Select the Always generate message contracts option.
You are creating an application using Visual Studio 2010. The application consumes a Windows Communication Foundation (WCF) service.You are adding a service reference to the WCF service. You need to ensure that the generated proxy does not block the calling thread when executing a service method.What should you do when adding the service reference? （）
A. Set the Collection type to ObservableCollection.
B. Select the Reuse types in all referenced assemblies option.
C. Select the Generate asynchronous operations option.
D. Select the Always generate message contracts option.
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