Why should the driver periodically test that an emergency exit's alarm sounds when the exit is opened?

Pick an answer

1. So the driver is alerted right away if a passenger opens it while the vehicle is moving
2. The alarm is only a formality with no real function during a trip
3. The alarm exists mainly to discourage passengers from sitting near the exit
4. It's tested only because it's required once a year for the vehicle's registration, not because of anything that happens during a normal trip

Correct!

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