A nurse is preparing a child who has cystic fibrosis for chest physiotherapy. Which of the following times is appropriate for the nurse to administer bronchodilator therapy in relation to chest physiotherapy?

A. Administering bronchodilator therapy immediately before chest physiotherapy helps open the airways, making the therapy more effective. B. Administering the bronchodilator 2 hours before is too early to have the desired effect during physiotherapy. C. Administering the bronchodilator 2 hours after does not support the immediate effectiveness of chest physiotherapy. D. Administering the bronchodilator immediately after chest physiotherapy does not provide the benefit needed during the procedure.