The nurse is caring for a 4-year-old client with cystic fibrosis who uses a high-frequency chest wall oscillation (HFCWO) vest for chest physiotherapy. After reinforcing education with the client's parents, which statement by a parent requires further teaching?

B I will give my child the nebulized bronchodilator treatment during therapy with the HFCWO vest. A I will allow my child to have a snack while using the HFCWO vest to encourage cooperation. D My child will use the HFCWO vest once in the morning, once in the evening, and as needed. C I will perform manual chest percussion on my child if the HFCWO vest is broken or unavailable.