What is the "stopping distance" of a vehicle?

1. AThe distance the vehicle travels from the moment the driver of the vehicle notices the danger ahead of him until the vehicle stops.
2. BThe distance the vehicle travels from the moment the driver reacts to the danger until the moment he presses the vehicle's brake pedal.
3. CThe distance required to stop at a certain speed.
4. DThe distance the vehicle travels from the start of braking until the vehicle stops.

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