Which of the following would BEST represent a detective security control?

A detective security control is designed to identify and alert personnel of unauthorized activities or breaches that have already occurred within a system or environment. Surveillance cameras are an effective representation of this type of control because they actively monitor and record activities, allowing for the detection of suspicious behavior or security incidents after they happen. With the footage captured, organizations can investigate incidents, determine the nature of any breaches, and respond accordingly.

In contrast, biometrics, access control, and system backups serve different security functions. Biometric systems primarily prevent unauthorized access by verifying identity at the point of entry, thus operating more as a preventive control. Access control mechanisms also focus on allowing or denying entry based on established permissions. Regular system backups are essential for recovery and maintaining data integrity but do not serve to detect security events or breaches; rather, they ensure that data can be restored in the event of data loss or corruption.