How do activity logs help to implement and maintain a security plan?

How do activity logs help to implement and maintain a security plan?
A . Activity logs provide advice on firewall installation, because they enable network baseline creation.
B . Activity logs remind users to log on with strong passwords, because the logs can be analyzed to see if users are complying with policy.
C . Activity logs allow you to determine if and how an unauthorized activity occurred.
D . Activity logs dissuade would-be hackers from breaching your security.

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Answer: C