A nurse is teaching the parents of a child who is to start using a metered-dose inhaler (MDI) to treat asthma. Which of the following information should the nurse include in the teaching?

"The spacer increases the amount of medication delivered to the oropharynx."

"The spacer increases the amount of medication delivered to the lungs."

"Inhale rapidly using the spacer with the MDI."

"Cover exhalation slots of the spacer with lips when inhaling."