A Patient Who Had Surgery Is Receiving Patient-Controlled Analgesia (PCA)

A patient who had surgery is receiving patient-controlled analgesia (PCA) . Which statement by the patient indicates an understanding of PCA use?

A) "I will not push the button too many times, so I won't get overdosed."
B) "I will need to be careful not to roll over the button when I sleep."
C) "I will be the only one that presses the button."
D) "I will use this button to help me sleep better."