The Nurse Is Teaching a Patient How to Do the Sustained

The nurse is teaching a patient how to do the sustained maximal inspiration (SMI) maneuver.Which instruction to the patient is correct?

A) Take a deep breath and hold it for 3 to 5 seconds before exhaling.
B) Take a slow deep breath and then forcefully exhale.
C) Take a deep breath and, at the peak of inspiration, expand the chest and take in a little more air.
D) Take a slow deep breath and then exhale slowly.