CompTIA Security+ Exam Prep

Answer: C - Cipher locks provide protection from bystanders learning a set code. Cipher locks are also known as programmable locks, are keyless, and use keypads to control access into an area or facility. The lock requires a specific combination to be entered into the keypad and possibly a swipe card. These locks usually have a corresponding visibility shield so a bystander cannot see the combination as it is keyed in. Automated cipher locks must have a backup battery system and be set to unlock during a power failure so personnel are not trapped inside during an emergency.