Which term refers to the layering of physical security countermeasures?

The term that refers to the layering of physical security countermeasures is "Security in Depth." This concept involves implementing multiple layers of security measures to create a comprehensive defense strategy. The idea is that if one layer is breached, subsequent layers will still protect the assets, thereby reducing the overall risk.

For example, a facility might employ perimeter fencing, security guards, video surveillance, access control systems, and alarm systems in conjunction. Each of these layers serves to provide a different type of protection, and together they enhance the overall security posture. This approach acknowledges that no single security measure is foolproof, and it synergizes the strengths of various measures to deter, detect, delay, and respond to security incidents.

In contrast, other options such as prevention, point security, and area security focus more on specific aspects or types of security rather than the comprehensive layering approach that "Security in Depth" embodies.