A mother is returning a demonstration for the instillation of saline nose drops for her 3-month-old infant who has nasal congestion. Which schedule is best for the practical nurse to recommend to the mother?

a. Administer anytime the infant is congested while awake.
b. Drop saline in nose every 4 hours during the day.
c. Instill in both nares 20 to 30 minutes before feeding.
d. Give when the infant is asleep and is not crying.