Which action should the nurse take when preparing patient-controlled analgesia for a postoperative patient?

1) Caution the patient to limit the number of times he presses the dosing button.

2) Ask another nurse to double-check the setup before patient use.

3) Instruct the patient to administer a dose only when experiencing pain.

4) Provide clear, simple instructions for dosing if the patient is cognitively impaired.