What describes a layered access control approach in a facility?

• A. Relying solely on CCTV camera coverage.
• B. Posting security guards only during night shifts.
• C. Combining badges, biometrics, guards, and physical barriers to prevent unauthorized entry at multiple points.
• D. Using a single badge reader at the main entrance.

Answer: (C)

Layered access control means building defense in depth for entry by using multiple, overlapping security measures at different points. Combining badges to verify identity, biometrics for stronger authentication, guards to observe and enforce, and physical barriers like doors, turnstiles, and fences creates several hurdles an unauthorized person must overcome. If one control is bypassed, others still stop entry, making breaches much less likely. This is stronger than relying on a single measure. Surveillance alone, guards only at night, or a single badge reader at the main entrance each provide only one line of defense and can be exploited, whereas layering these controls across multiple points creates a robust security posture.