A Nurse Is Providing Instructions to a Patient About How

A nurse is providing instructions to a patient about how to use a metered dose inhaler with a spacer. The nurse should instruct the patient to:

A) lie down while taking the medication.
B) gently roll the canister in the hands to mix the medication.
C) place the mouthpiece of the chamber in the mouth between the teeth and seal the lips around it. Completely exhale from the nose.
D) try to hold the breath for at least 3 seconds after inhaling the medication.