Which feature is an access control feature in security systems?

• A. Panic buttons: for immediate lockdowns
• B. Perimeter Intrusion Detection Systems
• C. Access control: card readers, tap-access
• D. Motion sensors: for hallways

Answer: (C)

Access control features determine who is allowed to enter a space and how they prove their identity. Card readers and tap-access are classic examples because they enforce permissions at the door: you present a credential, the system authenticates it, and the door is unlocked only if authorization is granted. This is what makes them true access control.

Panic buttons are for emergency signaling and can trigger a lockdown or alert security, not ongoing entry control. Perimeter intrusion detection systems monitor the boundary for breaches rather than controlling access at an entry point. Motion sensors detect movement in an area but don’t authenticate individuals or unlock doors.