Which of the following controls would BEST detect intrusion?

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Which of the following controls would BEST detect intrusion?

A.
User IDs and user privileges are granted through authorized procedures.

B.
Automatic logoff is used when a workstation is inactive for a particular period of time.

C.
Automatic logoff of the system occurs after a specified number of unsuccessful attempts.

D.
Unsuccessful logon attempts are monitored by the security administrator.

Explanation:
Intrusion is detected by the active monitoring and review of unsuccessful logons. User IDs and the
granting of user privileges define a policy, not a control. Automatic logoff is a method of preventing
access on inactive terminals and is not a detective control. Unsuccessful attempts to log on are a
method for preventing intrusion, not detecting.

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