The friend of an 18-year-old male client brings the client to the emergency department (ED). The client is unconscious and his breathing is slow and shallow. Which action should the nurse implement first? 1. Ask the friend what drugs the client has been taking. 2. Initiate an IV at a keep-open rate. 3. Call for a ventilator to be brought to the ED. 4. Apply oxygen at 100% via nasal cannula.