How should admins deal with vulnerabilities that they find in their systems?

How should admins deal with vulnerabilities that they find in their systems?
A . They should apply fixes, such as patches, to close the vulnerability before a hacker exploits it.
B . They should add the vulnerability to their Common Vulnerabilities and Exposures (CVE).
C . They should classify the vulnerability as malware. a DoS attack or a phishing attack.
D . They should notify the security team as soon as possible that the network has already been breached.

Answer: A