An administrator receives the following network requirements for a data integration with a third-party vendor:

Which of the following is the most appropriate response for the administrator to send?

A. FTP is an insecure protocol and should not be used.
B. Port 8080 is a non-standard port and should be blocked.
C. SSH protocol version 1 is obsolete and should not be used.
D. Certificate stapling on port 443 is a security risk that should be mitigated.