The Nurse Is Discharging a Patient with Asthma

The nurse is discharging a patient with asthma.As part of the discharge instruction,the nurse instructs the patient to prevent exacerbation by:

A) obtaining an appointment for follow-up pulmonary function studies 1 week after discharge.
B) limiting activity until the patient is able to climb two flights of stairs.
C) taking all asthma medications as prescribed.
D) taking medications on a "prn" basis according to symptoms.