Explain the term "axle" in a vehicle:

1. AA line along the vehicle from bumper to bumper and parallel to the longitudinal axis of the vehicle.
2. BThe rear cross beam in the chassis to which the towing pin of the tractor is attached.
3. CThe drive shaft that transmits the rotational motion from the gearbox to the differential.
4. DAn axle or system of axles installed across the width of the vehicle and on which the wheels are mounted.

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