When instructing a client on the use of an incentive spirometer, the nurse should instruct the ...

When instructing a client on the use of an incentive spirometer, the nurse should instruct the client to:
 
  a. take a deep breath and hold it for 3 seconds, then put the mouthpiece in the mouth and blow out as hard as possible.
  b. put the mouthpiece in the mouth, take a deep breath and hold it for 3 seconds, then blow out into the mouthpiece.
  c. take a deep breath and hold it for 10 seconds, then put the mouthpiece in the mouth and exhale and inhale deeply.
  d. take a normal breath and exhale, then seal the lips tightly around the mouthpiece; take a slow, deep breath and hold it for 3 seconds; then remove the mouthpiece and exhale normally.