What must flight attendants do if an AED is used?

When an Automated External Defibrillator (AED) is used during a flight, it is crucial for flight attendants to notify the captain. This action is important because the captain needs to be made aware of any medical emergencies that occur on board, particularly those that may lead to a change in flight operations or necessitate a priority landing. The captain can then make informed decisions regarding the flight situation, such as alerting the nearest airport for medical assistance upon landing or managing the overall safety of the flight.

While the other actions may seem relevant in their own contexts, notifying the captain is directly aligned with maintaining flight safety and ensuring proper procedures are followed in response to an emergency medical situation.