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 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"

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