An advantage of a master key system is that _____.

• A. It is inexpensive to implement
• B. It eliminates the need for keys entirely
• C. It is convenient for the owner or manager of the locking system
• D. It is always the most secure option

Answer: (C)

A master key system creates a hierarchy of access where different keys unlock different groups of locks, with a master key that can open multiple or all of them. The key benefit for the owner or manager is precisely this centralized convenience: they can carry and use one master key to access every area when needed, while other staff hold keys that only open their assigned doors. This makes day-to-day management, emergency access, and rekeying much more efficient in a multi-lock system.

This isn’t about being inexpensive to set up, since master-key systems typically require compatible hardware, careful planning, and ongoing administration. It also doesn’t eliminate the need for keys—people still carry keys for their specific doors. And it isn’t inherently the most secure option, because compromising the master key can grant access to many or all locks. The main practical advantage that stands out for a manager overseeing many locks is the convenient, centralized access control provided by a master key system.