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When must a reference line extend the full length of a bottom side rail?

A. When there are two or more areas of damage on the bottom side rail.
B. When there is a sharp bend in the bottom side rail.
C. When there is bowing over the entire bottom side rail.
D. When there is additional damage to the bottom side rail so that the reference line cannot be positioned over the ends of the damage.

Answer :

Final answer:

A reference line must extend the full length of a bottom side rail when there is bowing over the entire rail to ensure accurate assessment of damage and safety precautions.

Explanation:

A reference line must extend the full length of a bottom side rail when there is bowing over the entire bottom side rail. This is crucial to accurately assess the extent of damage and plan for repairs. If the reference line does not extend the full length, it might not capture the full scope of the issue, leading to potential safety risks.

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