A Nurse Is Teaching a Patient How to Perform Flow

A nurse is teaching a patient how to perform flow type incentive spirometry prior to his scheduled thoracic surgery. What instruction should the nurse provide to the patient?

A) Hold the spirometer at your lips and breathe in and out like you normally would.
B) When youre ready, blow hard into the spirometer for as long as you can.
C) Take a deep breath and then blow short, forceful breaths into the spirometer.
D) Breathe in deeply through the spirometer, hold your breath briefly, and then exhale.