You create a Windows Workflow Foundation application by using Microsoft .NET Framework 3.5.
The workflow must handle events raised by the application.

You create and compile the local communication contracts into an assembly.

You need to ensure that the application meets the following requirements:

Improves the design-time experience by using strong typing. Creates tightly-bound communication activities that correspond to the event parameters for the interface.

Which utility should you use?

A.
The wca.exe utility

B.
The wfc.exe utility

C.
The xsd.exe utility

D.
The svcutil.exe utility