The correct answer is A. is understood by the workers who use it . The CSSBB control-phase training-plan material states that after a new or revised process is created, training deployment must identify who needs training in order to sustain and maintain the change . It further says that all affected personnel should receive hands-on training on not only what must be done differently , but also why it is necessary. The same section adds that employees must understand the benefits of the process changes, their responsibilities, expectations, and how to do the task consistently.

This directly supports option A. Training is intended to ensure that the people who operate the process understand the new method well enough to perform it consistently and maintain the improvement. Training may help acceptance and support the control plan, but its clearest and most direct effect is process understanding by the users. It is not primarily for identifying other system constraints. Therefore, the best verified answer is A. is understood by the workers who use it .