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 child should not place their tongue on the mouthpiece, as this can affect the accuracy of the measurement. B. Blowing as hard and quickly as possible provides the most accurate reading of peak expiratory flow. C. Maintaining a semi-Fowler's position is not necessary for using the peak expiratory flow meter. D. The best measurement is the highest of three attempts, not an average.