For the SDP protocol, the m line is also called the media line, which describes the information such as the media type supported by the sender, and the second parameter is?

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For the SDP protocol, the m line is also called the media line, which describes the information such as the media type supported by the sender, and the second parameter is?
A . Transmission Protocol
B. Media name
C. Number of four payload types supported
D. Port number

Answer: D