What device is used to prevent 'tailgating' (piggybacking) at a secured entrance?

What device is used to prevent 'tailgating'

Multiple choice — select the best answer

AElectric strike
BMagnetic lock
CMantrap (or airlock vestibule)
DMotion detector

✓ Correct answer: C. Mantrap (or airlock vestibule) A mantrap (security vestibule/airlock) uses two interlocked doors so only one person can enter at a time, preventing tailgating. The second door will not open until the first closes and the individual is verified.

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Topic: Access Control

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