A user reports the inability to access a company server using the FTP protocol. A technician finds other ports to the server seem to work normally. The technician has determined the problem is an incorrectly configured software firewall on the user’s machine. Which of the following is MOST likely the cause?
A. Incoming connections on port 445 are blocked.
B. Outgoing connections on port 443 are blocked.
C. Incoming connections on port 143 are blocked.
D. Outgoing connections on port 80 are blocked.
E. Outgoing connections on port 21 are blocked.