Which of the following is classified as a Detective Control?

Close Circuit Television (CCTV) is classified as a detective control because its primary function is to monitor and record activities within a specific area. CCTV systems are designed to detect unauthorized access, security breaches, or other suspicious activities in real-time, allowing security personnel to respond quickly to incidents as they occur. By capturing video footage, CCTV acts as a deterrent to potential intruders and provides valuable evidence for investigations after an incident has taken place.

In contrast, other options like firewall access control lists and encryption protocols are preventive measures, aimed at stopping security threats before they can materialize. Physical security guards, while they may detect incidents, primarily serve a preventive role by controlling access and responding to threats as they arise, rather than primarily monitoring and recording.