Which action is important to take before pressing the brake in any slowing down or stopping?

1. AShifting down to a lower gear.
2. BPressing the clutch pedal, in order to reduce the engine's fuel consumption.
3. CDirecting the gaze to the mirrors, in order to check for the presence of a vehicle behind.
4. DSignalling and turning the steering wheel to the road shoulder, in order to avoid a collision from behind.

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