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The correct answer is identified as the "Cut Root." In locksmith terminology, the term "Cut Root" specifically refers to the bottom portion of a key cut, which is essential in understanding how the key interacts with the pin tumblers inside a lock. The Cut Root is significant because it determines the depth at which the pin tumbles open, allowing the key to rotate the lock mechanism properly.

In contrast, other options do not accurately describe the bottom of a key cut. For example, a Depth Key Set is a tool used to measure various depths of key cuts but does not refer directly to the key cuts themselves. Similarly, the Cut Root Shape might imply a specific contour or design of the cut, but it does not pinpoint the bottom part of the cut as the term "Cut Root" does. Lastly, a Code Original Key relates to keys that are produced based on a code system, but this does not pertain to the physical characteristics of the key cuts, especially the bottom part. Therefore, the clarity of the term "Cut Root" in relation to key cutting practices makes it the most accurate choice among the options provided.