The nurse is caring for a child with cystic fibrosis. What is the rationale for the nurse performing chest physiotherapy for this child?

A. Monitoring lung function and oxygen saturation is important but not the primary purpose of chest physiotherapy. B. Chest physiotherapy does not primarily focus on pain relief or reducing inflammation; instead, it targets mucus clearance. C. Chest physiotherapy is primarily performed to enhance lung function by mobilizing and clearing thick mucus from the airways, which is critical in managing cystic fibrosis and preventing infections. D. While medications can be administered via nebulization, chest physiotherapy itself is not used for direct medication delivery but rather for airway clearance.