A nurse is reinforcing teaching with a client who has diabetes mellitus about using a glucometer to monitor her blood glucose. Which of the following actions should the nurse identify as an indication that the client understands the instructions?

B Uses the ball of a finger as the puncture site D Avoids using the fingers of her dominant hand as puncture sites C Avoids using the thumbs as puncture sites A Uses the side of a fingertip as the puncture site