With regard to the File Transfer Protocol (FTP), which of the following statements is true?

With regard to the File Transfer Protocol (FTP), which of the following statements is true?
A . FTP always uses TCP port 20 for the data session and TCP port 21 for the control session.
B . FTP always uses one TCP session for both control and data.
C . In active mode, the server uses the "PORT" command to tell the client which port it will used to send data.
D . With passive mode FTP, both the control and data TCP sessions are initiated by the client.
E . FTP always uses TCP port 21 for the data session and TCP port 20 for the control session.

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Answer: D