Which of the following is not a type of security system protection?

• A. Barrier protection
• B. Perimeter protection
• C. Access control
• D. Video surveillance

Answer: (A)

The key idea is how security protections are categorized in a security system design. Perimeter protection covers measures that defend the outer boundary of a space—things like fences, gates, and entry-point sensors. Access control focuses on who is allowed to enter and how they gain entry, using credentials, locks, or door controllers. Video surveillance provides ongoing monitoring and recording to deter, detect, and review activity.

Barrier protection, while related to physical safety, isn’t treated as a separate, distinct category of security system protection in the same way. It’s more of a physical obstacle that supports protection and typically falls under the broader umbrella of perimeter protection or is considered a basic physical defense component rather than a separate security-system function. Thus, barrier protection isn’t classified as one of the standalone security system protection types like perimeter protection, access control, or video surveillance.