To add an extra layer of protection for a highly restricted zone by using a pair of interlocked doors and identity verification is correct.

A mantrap is a small controlled space between two interlocked doors where only one door can open at a time and identity or authorization is verified before the second door will unlock. This arrangement prevents tailgating and unauthorized entry and it allows security staff or automated systems to perform secondary checks or screenings before admitting someone into the sensitive area.

To offer a rapid emergency egress path from a controlled area is wrong because mantraps are not designed to provide fast emergency escape. They can impede quick egress and emergency exits and life safety systems are planned separately to meet building and fire codes.

To consolidate entrances to reduce construction and maintenance expenses is wrong because the primary purpose of a mantrap is to improve security and not to save cost. Consolidating entrances might incidentally affect expenses but it is not the defining function of a mantrap.

To enable precise entry logging for compliance monitoring and audit trails is wrong because although mantraps are often integrated with access control systems that log events the main function of a mantrap is physical access control and preventing unauthorized passage. Logging is a secondary benefit provided by the connected systems and not the primary purpose of the mantrap itself.

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