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Which keying system has exactly three levels?

  1. Great Grand Master Key System

  2. Grand Master Key System

  3. Four Column Progression

  4. Five Pin Master Key System

The correct answer is: Grand Master Key System

The Grand Master Key System is characterized by having exactly three levels of keying. In this system, there are typically individual locks that can each be operated by their own change key, which provides the first level. The second level involves a master key that can operate multiple locks, providing access to a group of locks within a certain area or department. The third level is the Grand Master key, which is able to operate all the locks in multiple groups, thus allowing broader access throughout a larger facility. This particular structure allows for organized access control, making it ideal for larger buildings or facilities where different levels of access need to be maintained. While the Great Grand Master Key System involves an additional level, making it four levels, the other options, such as the Four Column Progression and the Five Pin Master Key System, do not specifically outline a three-level system. The focus on three distinct access levels makes the Grand Master Key System the appropriate answer to the question regarding keying systems with exactly three levels.