Within an organization's physical security program, an alarm that sounds when a server room door is forced open is classified as what type of control?
Corrective control
Preventive physical barrier
Detective (monitoring) control
Recovery control
Alarm systems do not physically stop an intruder; instead, they monitor an area and generate alerts when unauthorized access or environmental changes occur. This makes them detective (monitoring) controls. Physical barriers such as bollards or locks are preventive, corrective controls repair damage after an event, and recovery controls focus on restoring operations or data-none of which describe an audible alarm's primary function.
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