What is a security measure that involves controlling physical access to facilities?

Controlling physical access to facilities is a fundamental aspect of ensuring the overall security of an organization's assets and sensitive information. Physical security encompasses a range of measures designed to protect the physical premises from unauthorized access, damage, or interference.

This includes elements such as security guards, access control systems, locks, surveillance cameras, and barriers. By implementing these physical security measures, organizations can prevent unauthorized individuals from entering sensitive areas, thereby protecting their data and resources from theft, vandalism, or other malicious acts.

In contrast, the other options refer to security measures focused on different aspects of information systems. Network segmentation handles the logical separation of networks to improve security and performance; application security involves protecting software applications from vulnerabilities and attacks; and cybersecurity is a broader term that encompasses the protection of computer systems and networks from digital attacks. Each of these plays a vital role in an organization's overall security posture but does not specifically address the control of physical access to facilities.