Answer:
C) change request
Step-by-step explanation:
From an organizational standpoint, a maintenance function typically doesn't require change request paperwork unless it is defined as a change. For example, if you are replacing a valve with the same make and model, then nothing has changed because you are just maintaining what is already there. However, if you were to change that valve with a different type of valve, that would constitute a change because the original design included the existing valve, so a review would be warranted via the change request before the replacement is made.