You plan to create a Windows application by using the .NET Framework 3.5.
The Windows application must use a proprietary protocol to connect to a Windows Communication
Foundation (WCF) service. The application persists data to a Microsoft SQL Server 2008 database by
using the WCF service.
You need to analyze the feasibility of creating the application.
Which proof of concept should you create?

A.
A Windows application that connects to a WCF service by using HTTP

B.
A Windows application that connects directly to a SQL Server 2008 database

C.
A Windows application that connects to a WCF service by using the proprietary protocol

D.
A Windows application that connects to a WCF service by using HTTP and persists data to a SQL
Server database