A nurse is providing teaching to a client who is about to begin using a PCA pump to deliver morphine for postoperative pain management. Which of the following statements by the client indicates an understanding of the teaching?

A. The lockout interval is a safety feature that prevents the client from receiving another dose of medication too soon, thereby preventing overdose. This statement demonstrates an accurate understanding of how the PCA pump works. B. PCA pumps deliver smaller, controlled doses compared to full morphine injections, and the dose is set by the provider, not necessarily equal to a standard injection. C. Only the client should push the PCA button. Family members or staff pressing it is contraindicated and considered unsafe due to the risk of oversedation or respiratory depression. D. Relief from IV PCA morphine is generally felt within a few minutes, not 30 minutes, due to its rapid onset of action.