In which vehicle is it obligatory to install a reversing buzzer?

1. AEvery goods vehicle is required to have a buzzer.
2. BIn a vehicle whose total permitted weight is more than 4,000 kg.
3. CIn a commercial vehicle and a work vehicle whose total permitted weight is more than 15,000 kg, in a tractor and in a bus.
4. DIn a vehicle whose total permitted weight is 12,000 kg or less.

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