North Carolina Locksmith Practice Exam 2025 - Free Locksmith Practice Questions and Study Guide

The term "Three Column Progression" specifically refers to a method of key bitting that employs three distinct columns. This technique is often utilized in lock manufacturing and key design, allowing for a more complex and varied method of creating keys. Each column represents a different series of cuts and depths within the key, which leads to a broader range of possible key combinations. This enhances security by increasing the number of potential key configurations, making it more challenging for unauthorized individuals to duplicate keys or pick locks.

The other options, while related to lock and key concepts, do not accurately define the "Three Column Progression." A master key for all combinations doesn't align with the specific structure and function implied by the term. Measuring a key's security pertains more to its overall design and effectiveness against unauthorized access, rather than the specific configuration of bitting. Lastly, while securing locks is certainly a fundamental aspect of locksmithing, it encompasses broader principles and practices that go beyond the detailed method described by "Three Column Progression." Thus, option B is the most accurate description of the term.