While Teaching a Patient with Asthma the Appropriate Use of a Peak

While teaching a patient with asthma the appropriate use of a peak flow meter, the nurse instructs the patient to

A) take and record peak flow readings when having asthma symptoms or an attack.
B) increase the doses of long-term control medications for peak flows in the red zone.
C) use the flow meter each morning after taking asthma medications.
D) empty the lungs and then inhale rapidly through the mouthpiece.