Discussion
The beacon is activated by
Answer: C
Correct answer: Immersion in water
A water-activated switch closes when the beacon is submerged, so it starts transmitting on immersion and not before. That is what preserves the battery: a beacon triggered by impact or by power loss would run down on an accident ashore where it is not needed.
Nothing from the flight deck is involved, and it must work with the aircraft's electrical system destroyed. The design is deliberately simple, with no logic to fail - contact with water is the whole of the activation.
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