How would you conduct yourself in a vehicle with automatic transmission, when driving down a continuous steep road?

1. A Apply the brake pedal intermittently to slow the vehicle down and shift into a lower gear, depending on the slope.
2. B Shift into high gear according to the slope and step continuously on the brake pedal to slow down.
3. C On a steep and continuous downhill road, use the brake system only, without shifting into an adjusted gear.
4. D On a steep and continuous downhill road, shift into an appropriate gear and continue driving.