The use of a master key system is not acceptable in _____.

• A. Public areas
• B. Secure areas
• C. Parking areas
• D. Exterior doors

Answer: (B)

A master key system consolidates access so one key opens multiple locks. That convenience comes with a key risk: if the master key is lost or stolen, it can unlock many doors, bypassing individual lock protections. In secure areas, you need strict, limited access to protect sensitive spaces and maintain accountability. Allowing a single key to open many secure doors defeats that tight control and creates a single point of failure. So, the use of a master key system is not acceptable in secure areas because it undermines strict access control and increases the potential for unauthorized entry.

In other contexts, such as public or exterior areas, a master key can be used in a managed way for maintenance or operations, but even there it must be carefully controlled and audited.