You are creating a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5. You need to use a custom service host to host the WCF service in Windows Activation Services (WAS). What should you do?

A.
Write hosting code for the WCF service.

B.
Add a reference to the custom service host in the web.config file.

C.
Add code to instantiate the custom service host from within the main procedure of the WCF service.

D.
Create a custom service host factory that instantiates the custom service host. Include a reference to this factory in the .svc file.