In a Communication Protocol, Can the Sender Indicate How Many

Multiple Choice

In a communication protocol, can the sender indicate how many bytes are contained in the request?

A) Yes, the web server does that at the end of the GET request.
B) Yes, the web browser does that in POST request.
C) Yes, the web browser does that at the end of the HTTP header.
D) No, the sender can't indicate how many bytes are contained in the request.