Which type of control would be considered a deterrent for physical security issues?

A fence serves as a physical barrier that can deter unauthorized individuals from trespassing or accessing restricted areas. Its presence can signal to potential intruders that access is limited and discourage them from attempting to breach the property. A fence can provide a clear boundary that defines the secure area, making it less inviting for those who may think of engaging in theft, vandalism, or other physical security incidents.

In contrast, while security guards, surveillance cameras, and access control systems are also important components of a security plan, they primarily act as active security measures rather than merely deterrents. Security guards can intervene in real-time, surveillance cameras can provide evidence after an event, and access control systems manage who has the ability to enter a secured area. These measures help respond to or monitor incidents but may not inherently prevent an intrusion when compared to the physical barrier created by a fence. Thus, a fence is specifically effective as a deterrent in physical security contexts.