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?

A. The risk of overdose is minimized by the device's programming. B. The medication is limited based on a preset dose and frequency. C. PCA pumps deliver a controlled dose of medication, preventing overdose by limiting the amount dispensed. D. Only the client should press the button to ensure safety.