What Would the Nurse Teaching an Asthmatic Child the Technique

What would the nurse teaching an asthmatic child the technique of pursed-lip breathing include?

A) Inhale deeply through nose with mouth closed.
B) Make exhalation twice as long as inhalation.
C) Use medicated inhaler prior to performing breathing exercise.
D) Exhale through mouth as if whistling.
E) Exhale forcefully.