What characterizes driving in which an appropriate distance is kept from the vehicle ahead?

1. ASuch driving encourages other drivers to enter the gap kept ahead.
2. BKeeping a gap has no effect on the character of the driving.
3. CCalmer driving with less stress, that does not cause fatigue and prevents dangers.
4. DDriving that requires adjusting the distance again and again at all times, according to the terrain conditions, and tires the driver.

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