You are designing a Windows Presentation Foundation (WPF) application by using
Microsoft .NET Framework 4 and Microsoft Visual Studio 2010. The application will consist
of a user interface (UI) tier and a middle tier. The middle tier will be implemented by using
Windows Communication I Foundation (WCF). Each method in the middle tier will contain
the following catch block. Catch (Argument-NullException e) { thcow e; } When testing the
application, you discover that all ArgumentNullExceptions exceptions that occur in the
middle tier do not contain accurate stack trace information. You need to design the
exception handling strategy for the application. What should you do?

A.
Use a DispatcherUnhandledExceptionEvent handler in the UI tier.

B.
Use a DispatcherUnhandledExceptionEvent handler in the middle tier.

C.
Create an ArgumentFMullException handler in the UI tier.

D.
Remove the exception parameter from the ArgumentNullException handler.