You create an application by using Microsoft Visual Studio 2008 and the .NET Framework 3.5.
The application uses a Windows Workflow Foundation controller component to call an ASP.NET Web service.
You need to develop an integration test to ensure that the Web service and the Workflow component interact appropriately.
What should you do?

A.
Write a test stub to perform the functions of the Web service proxy.

B.
Write a test stub to perform the functions of the Workflow component.

C.
Write a test driver that ensures that the Web service proxy returns the expected data.

D.
Write a test driver that ensures that the Workflow component calls the appropriate method on the Web service proxy.