Which of the following is not a physical security control?

The correct answer pertains to the understanding of physical security controls, which are tangible measures taken to protect physical assets. Identification cards, surveillance cameras, and security guards are all direct physical measures used to prevent unauthorized access and monitor activities.

Identification cards provide access control by allowing only authorized personnel into certain areas, while surveillance cameras serve as a deterrent and a means to monitor and record activity within a facility. Security guards actively protect premises through their presence, enforcing rules, and responding to incidents.

In contrast, firewall systems are not considered a physical security control. Firewalls are software or hardware solutions that manage and protect network traffic, operating primarily within the realm of cybersecurity rather than physical security. Their function is to prevent unauthorized access to networks and systems rather than secure physical spaces or assets. This distinction is crucial when categorizing security measures in a comprehensive security framework.