Which of the following ports is used by the Remote Desktop Protocol?

A.
80

B.
23

C.
3389

D.
110

Explanation:
Port 3389 is used by the Remote Desktop Protocol.

Answer B is incorrect. Port 23 is used by the TELNET protocol.

Answer A is incorrect. Port 80 is used by the HTTP protocol.

Answer D is incorrect. Port 110 is used by the POP3 protocol.