Which statement about the HTTP protocol is true?
A. The request method does not include the protocol version.
B. The proxy acts as an intermediary receiving agent in the request-response chain.
C. The tunnel acts as an intermediary relay agent in the request-response chain.
D. The gateway acts as an intermediary forwarding agent in the request-response chain.
E. The success and error codes are returned in the response message by the user-agent.
