Which of the following describes a physical security measure in IT?

The correct answer focuses on physical security measures, which are essential for protecting IT infrastructure and assets from unauthorized access, theft, or damage. Locks, cameras, and security guards directly address the tangible aspects of security in an organization's facilities.

Locks are used to secure entry points, ensuring that only authorized personnel can access sensitive areas where IT equipment may be housed. Cameras act as surveillance tools, helping to monitor and record activities within these spaces, thereby deterring potential intruders and providing evidence if security incidents occur. Security guards are physical personnel who can manage access control and respond to security breaches effectively.

In contrast, the other options relate to cybersecurity measures that protect data and networks rather than physical premises. For example, firewalls and antivirus software safeguard against digital threats, while virtual private networks create secure connections over the internet. Data encryption methods protect the confidentiality and integrity of data but don’t involve physical security controls at the facilities where data is stored or processed. Thus, locks, cameras, and security guards are the best representation of physical security measures in an IT context.