You are working as a technician at AIOTestKing.com. You are asked to help a user at a branch office with an application problem. You try to connect to a users desktop using Remote Assistance but is unable to connect and the invitation keeps timing out and you suspect that the firewall is blocking your request. Which of the following ports should you confirm that it is open for traffic in the firewall in order to allow Remote Assistance?

A.
TCP port 3359

B.
TCP port 21

C.
TCP port 80

D.
TCP port 3389