问题：
[单选题]
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.
参考答案：
B
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