What equipment is primarily associated with the operation of an AED?

The operation of an Automated External Defibrillator (AED) primarily relies on electrodes. These electrodes are adhesive pads that are placed on the patient's chest to detect the heart's rhythm and deliver an electric shock if necessary. The electrodes enable the AED to analyze the heart's activity and provide guidance to the rescuer on whether a shock is required. This critical function highlights the importance of electrodes as they are essential for the effectiveness of the AED in responding to cardiac emergencies.

The other options, while important in various first aid scenarios, do not play a direct role in the operation of an AED. Respirators are used for providing breathing assistance but are unrelated to the AED's defibrillation capabilities. Stretchers are used for transporting individuals safely but have no connection to the electronic functioning of an AED. A first aid kit contains various medical supplies but does not provide the specific requirements needed for defibrillation that the electrodes do.