單項選擇題

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application uses the drag-and-drop functionality. 
You need to ensure that the drag-and-drop operation is stopped when a user moves the cursor outside the boundaries of the application form. 
Which enumeration member should you use?()

A. DragAction.Cancel
B. DragAction.Drop
C. DragDropEffects.None
D. DragDropEffects.All

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