Practise Question Bank Filters#6898 3p SpecialistD, D1 What is the most effective way of speeding up a bus? ABy reaching the maximum RPM of the engine in all subsequent gears.BBy changing gears in such a way that the RPM of the engine is not lower than the starting value of the green area on the tachometer.CBy using all gears successively, even if the tachometer indicator is in the red area.