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Which method indicates the functionality of keys in a master key system?

  1. Standard Key Coding System

  2. Master Key Annotation

  3. Key Functional Designation

  4. Key Identification Method

The correct answer is: Standard Key Coding System

In a master key system, the method that indicates the functionality of keys is through the standard key coding system. This system uses a specific coding procedure that ensures each key corresponds to its designated lock and leverages the hierarchical structure of the master key system. Each key in the system can operate either a set of locks or specific locks based on the coding, allowing for varied access levels. The standard key coding system is essential for organizing keys and ensuring security management within the system by clearly defining the relationships between different keys and locks. It enables locksmiths and users to identify which keys can operate particular locks based on their assigned codes, significantly enhancing organizational security and management. In contrast, while other methods like master key annotation and key functional designation may contribute to understanding the structure or purpose of keys within a system, they do not single-handedly indicate the functionality in the way that the standard key coding system does. The key identification method might assist in recognizing the individual keys but lacks the explicit framework provided by the coding system to define their operational capabilities within the broader master key context.