A nurse is instructing a school-age child who has asthma about the use of a peak expiratory flow meter. Which of the following instructions should the nurse include in the teaching?

A. The tongue should not touch the mouthpiece, as it can block airflow. B. The child should record the highest (not the average) of three readings. C. The child should stand upright for the most accurate results, not in semi-Fowler’s position. D. The peak expiratory flow meter (PEFM) measures how quickly the child can exhale, helping monitor asthma control. The child should blow out as hard and fast as possible.