A staff nurse is observing a newly licensed nurse suction a client's tracheostomy. Which of the following actions by the newly licensed nurse requires intervention by the staff nurse?

A. Waiting for 2 minutes between suctions allows the client to recover and maintain oxygenation. B. Inserting the catheter without suction prevents damage to the tracheal mucosa. C. Suction should only be applied for 10 seconds or less to prevent hypoxia and mucosal trauma. Applying suction for 15 seconds increases the risk of oxygen depletion. D. Encouraging the client to cough helps mobilize secretions and facilitates airway clearance.