A nurse is providing teaching to a client who is about to begin using a PCA pump to deliver morphine for postoperative pain management. Which of the following statements by the client indicates an understanding of the teaching?

"The lockout interval prevents me from receiving too much medication."

"Each time I push the button, I receive the same amount as a morphine injection."

"My family can push the button for me on a regular basis."

"It will take about 30 minutes to feel relief after I push the button."