Mr. Chu suddenly falls to the ground. He has no pulse and is not breathing. You have been trained in a special procedure to provide breathing and circulation. The abbreviation for this procedure is _____
a) CPR (Cardiopulmonary Resuscitation)
b) AED (Automated External Defibrillation)
c) PPE (Personal Protective Equipment)
d) ABC (Airway, Breathing, Circulation)