Interference between the teeth of two meshing involute gears can be reduced or eliminated by 1). Increasing the addendum of the gear teeth and correspondingly reducing the addendum of the pinion 2). Reducing the pressure angle of the teeth of the meshing gears 3). Increasing the centre distance Which of the statements given above is/are correct?

(a) 1 and 2

(b) 2 and 3

(c) 1 only

(d) 3 only.