【单选题】
You are creating a Windows application for graphical image processing by using the .NET Framework 3.5. You create an image processing function and a delegate.You plan to invoke the image processing function by using the delegate.You need to ensure that the calling thread meets the following requirements： <br /> （1）It is not blocked when the delegate is running  <br /> （2）It is notified when the delegate is complete<br /> What should you do？（）
A、Call the Invoke method of the delegate.
B、Call the BeginInvoke and EndInvoke methods of the delegate in the calling thread.
C、Call the BeginInvoke method by specifying a callback method to be executed when the delegate is complete.Call the EndInvoke method in the callback method.
D、Call the BeginInvoke method by specifying a callback method to be executed when the delegate is complete.Call the EndInvoke method of the delegate in the calling thread.
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