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

The process referred to as key progression involving four columns of key bitting array is accurately represented by the four-column progression. This process is designed to systematically arrange key cuts in a manner that facilitates the creation of various keys that will operate a specific lock.

In this context, a four-column progression uses four distinct variables or "columns" to define the possible cuts or depth of a key. Each column represents a position on the key, and by manipulating the depths in each column, a locksmith can generate multiple unique configurations. This method not only allows for the creation of several keys for a single locksmithing system but also aids in providing a higher level of security and control.

The other options, such as a five pin master key or change key, do not correspond to this specific structural approach. A block master typically relates to a more general type of master keying system rather than detailing progression with a specific number of columns. Thus, the correct choice clearly delineates the four columns utilized in the key bitting array process.

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