Which actions would best protect the computers with the software package installed?

After installing a software package on several workstations, an administrator discovered the software opened network port TCP 23456 on each workstation. The port is part of a software management function that is not needed on corporate workstations.

Which actions would best protect the computers with the software package installed?
A . Document the port number and request approval from a change control group
B . Redirect traffic to and from the software management port to a non-default port
C . Block TCP 23456 at the network perimeter firewall
D . Determine which service controls the software management function and opens the port, and disable it

Answer: D