Why should a driver make sure the bus's warning light system is checked and functioning correctly during the pre-trip inspection, not just visually confirmed as present?

Pick an answer

1. The warning light system never requires any pre-trip verification
2. Visual confirmation alone is always sufficient without testing that the lights illuminate, since a bulb that is present will work
3. Warning light checks are relevant only during the vehicle's annual inspection
4. A malfunctioning bulb or circuit could leave a warning signal ineffective exactly when it is needed most

Correct!

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