You check the logs on several clients and find that there is traffic coming in on an odd port (port 1872).
All clients have the Windows XP firewall turned on. What should you do to block this unwanted traffic?

A.
Perform a virus scan to find the virus responsible for this traffic.

B.
Check the exceptions in the firewall and unselect that port exception.

C.
Trace back that traffic and find its origin.

D.
Shut down the service that connects to that port.