A nurse is teaching a client who had a total knee arthroplasty about self-administering morphine via a patient-controlled analgesia (PCA) infusion device. Which of the following client statements indicates an understanding of the teaching?

"I should only use the device when it's absolutely necessary.”.

"I'll be careful about pushing the button so I don't overdose.”.

"I will ask my family to push the dose button when I am asleep.”.

"I should tell the nurse if I can't control my pain with this device.”.