Analysis of a recent security breach at an organization revealed that the attack leveraged a telnet server that had not been used in some time. Below are partial
results of an audit that occurred a week before the breach was detected.
OPEN PORTS—TCP 23, TCP 80, TCP 443
OS PATCH LEVEL—CURRENT
PASSWORD AUDIT—PASS, STRONG
FILE INTEGRITY—PASS
Which of the following could have mitigated or deterred this breach?

A.
Routine patch management on the server

B.
Greater frequency of auditing the server logs

C.
Password protection on the telnet server

D.
Disabling unnecessary services