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The acronym AED stands for Automated External Defibrillator, which is a crucial device in emergency medical situations, particularly in the context of aircraft. An AED is specifically designed to diagnose and treat life-threatening cardiac arrhythmias through defibrillation, which involves delivering a shock to the heart to restore its normal rhythm.

In an aircraft setting, having an AED on board can be critical for responding to a passenger or crew member experiencing a cardiac event. Training for cabin crew usually includes how to locate and operate an AED, as quick access and effective use can potentially save lives during in-flight medical emergencies.

The other options do not accurately reflect the meaning of AED in this context, as they refer to various other safety devices or protocols that are not specifically related to cardiac emergencies on an aircraft. The specificity and medical function of the Automated External Defibrillator make it the correct choice.