Consider the following statements:
The transmission of motion from a pinion to a meshing gear of involute profile is a case of
1. Pure rolling
2. Sliding with constant velocity of sliding
3. Sliding with time varying velocity of sliding
4. Rolling with some amount of sliding
Which of these statements are correct?
(a) 3 and 4 only (b) 1 and 2 only
(c) 2 and 3 only (d) 1, 2, 3 and 4