A nurse is caring for an adolescent client who has cystic fibrosis. Which of the following actions should the nurse instruct the client to take prior to initiating postural drainage?

A. Oral hygiene is important but not necessary before postural drainage. B. Using a bronchodilator such as albuterol before postural drainage helps open the airways, making it easier to clear mucus. C. Eating a meal before postural drainage can increase the risk of aspiration. D. Pancrelipase is used to aid digestion and is taken before meals, not before postural drainage.