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A
Add color
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B
Remove residual chemical so processing fully stops and the scalp/hair are not left coated
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C
Cut the hair
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D
Skip neutralizing
Why this is the answer
Thoroughly rinsing out the product at the end of a chemical service (and after neutralizing, where applicable) is important to remove residual chemical so that processing fully stops and the scalp and hair are not left coated with active product that could continue to act, irritate the skin, or damage the hair. Incomplete rinsing can lead to irritation and over-processing. Proper rinsing per the manufacturer's directions is a finishing safety step. Its importance is part of the careful procedure the chemical-service content stresses.
Source: Hair Care — Thorough Rinsing