The Nurse Is Teaching a Mother How to Perform Chest

The nurse is teaching a mother how to perform chest physiotherapy and postural drainage on her 3-year-old child, who has cystic fibrosis. To perform percussion, the nurse should instruct her to:

A) Cover the skin with a shirt or gown before percussing.
B) Strike the chest wall with a flat-hand position.
C) Percuss over the entire trunk anteriorly and posteriorly.
D) Percuss before positioning for postural drainage.