You have an existing Windows Communication Foundation (WCF) service that exposes a service contract over HTTP. You need to expose that contract over HTTP and TCP. What should you do?（）

• A、Add a net.tcp base address to the host.
• B、Add an endpoint configured with a netTcpBinding.
• C、Add an endpoint behavior named netTcpBehavior to the existing endpoint.
• D、Add a binding configuration to the existing endpoint named netTcpBinding.