What does "physical security" primarily involve?

The concept of "physical security" is fundamentally focused on the measures taken to protect personnel, property, and sensitive information from physical threats, such as theft, vandalism, natural disasters, and unauthorized access. This involves implementing a range of strategies and systems, including access controls, surveillance, barriers, and alarm systems, aimed at deterring, preventing, or responding to physical security breaches.

In this context, the correct choice emphasizes a proactive approach to safeguarding assets and individuals, which is critical for maintaining safety and security within any organization, especially in military and defense environments. The other options pertain to different aspects of operations: planning fitness programs is related to personnel health, conducting military drills focuses on operational readiness, and establishing communication networks is about ensuring effective information exchange. None of these directly address the core functions of physical security.