What should you do?

You are designing a Windows Presentation Foundation (WPF) application for your company by using Microsoft NET Framework 4 and Microsoft Visual Studio 2010.
The user interface (UI) tier of the application will be developed by using Windows Presentation Foundation (WPF).
The middle tier of the application will be developed by using Windows Communication Foundation (WCF).
You plan to use several legacy third-party COM components. You do not have access to the source code of these components
You need to ensure that the following requirements are met
"The middle tier can use the COM components
"Application developers can debug the application.
"The application must allow for a gradual migration away from the COM components
What should you do?
A. Add references to the COM components in the UI tier
B. Design a thin interface layer assembly that uses COM Callable Wrappers (CCWs) to dynamically access the COM components
C. Design a new Primary Interpol Assembly (PIA) by using appropriate source attenuates for the COM components In the PIA, expose selected elements of the components that can be used by developers
D. Design a custom wrapper assembly that uses the methods of the Type Lib Converter class to load and interface to the COM components. Expose managed NET methods that dynamically access the corresponding COM methods.

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