As you arrive at your​ patient's side, the patient goes into cardiac arrest. You​ should:
A. begin CPR and apply the AED only after another EMT has arrived.
B. perform 2 minutes of CPR before applying the AED.
C. insert an oropharyngeal airway and ventilate for 2 minutes before applying the AED.
D. attach the AED and deliver a single shock as indicated.
