In which cases is it permitted to drive a vehicle downhill in neutral gear?

1. AOn a non-urban road with moderate descents, it is permitted to shift into neutral gear in order to save fuel.
2. BOn a moderate descent where there is no danger of the brakes overheating, it is possible to drive in neutral gear in order to save fuel.
3. CIn a public vehicle, a bus and a taxi, it is permitted to shift into neutral gear on a descent on a non-urban road only.
4. DForbidden in any case. When driving downhill, one of the gears must be engaged and operating.

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