A nurse is providing preoperative teaching to a client about the administration of morphine via a PCA pump. Which of the following statements by the client indicates an understanding of the teaching?

"Using this machine increases my risk of overdose."

"I will receive a limited amount of pain medication when I press the button."

"I can get pain medication any time as long as I press the button."

"My partner can press my pain medication button for me if I am sleeping."