Define "axle", in a vehicle:

1. AA shaft or system of shafts across the width of the vehicle on which the wheels are mounted.
2. BThe rear cross-beam in the vehicle to which the spare wheel of the vehicle is attached.
3. CThe front part of the vehicle intended to absorb collision damage at low travel speed.
4. DA shaft that transmits in the vehicle the rotational movement from the gearbox to the engine.

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