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To indicate the approach of their vehicle to other road users, the driver must use:

AAudible signals, at night, in built-up areas.
BThe direction indicator signal.
CAudible signals in built-up areas, during the day, but only in case of imminent danger.Correct
Explanation
Within built-up areas, the use of audible signals is heavily restricted to avoid excessive noise. Thus, during the day, these signals can only be used in case of imminent danger to alert other users of the vehicle's approach. At night, within built-up areas, audible signals must be replaced by light signals, so the use of the horn during this period is incorrect. In turn, direction indicators are used exclusively to signal changes in trajectory and not to announce the vehicle's approach.
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