A client with respiratory failure has a respiratory rate of 6 breaths/min and an oxygen saturation (SpO2) of 88%. The client is increasingly lethargic. Which intervention will the nurse anticipate?

Insertion of a tracheostomy with frequent suctioning

Endotracheal intubation and mechanical ventilation

Initiation of continuous positive airway pressure (CPAP)

Administration of 100% O2 by non-rebreather mask