What is the primary function of an Automated External Defibrillator (AED)?

The primary function of an Automated External Defibrillator (AED) is to provide electrical shocks to revive heart rhythms. When someone experiences sudden cardiac arrest, their heart can develop an abnormal rhythm that prevents it from pumping blood effectively. An AED analyzes the heart's rhythm and determines if a shock is needed to restore a normal rhythm. The shock delivered by the AED aims to reset the heart's electrical activity, allowing it to resume its normal functioning.

The other choices do not accurately describe the main purpose of an AED. Measuring heart rates and monitoring blood pressure are functions associated with other medical devices rather than an AED. While oxygen supply may be critical in emergencies, it is the defibrillation capability of an AED that specifically addresses the immediate need during a cardiac arrest situation.