A Windows User Contacted the Help Desk with a Problem

Multiple Choice

A Windows user contacted the help desk with a problem that requires the technician to connect to the remote computer using Remote Assistance to view a very detailed and cryptic error message on the user's desktop. Each attempt the technician makes to connect to the remote computer results in a message stating the connection was refused.  
Which of the following protocol and port number combinations should be opened on the remote computer's firewall to allow this connection?

A) RDP, port 3389
B) SSH, port 22
C) Telnet, port 23
D) DNS, port 53