A nurse is reinforcing teaching with a client who is receiving morphine via a patient-controlled analgesia (PCA) infusion device. Which of the following statements by the client indicates an understanding of the teaching?

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

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

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

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