Consider the following statements:
In the case of involute gears in contact
(i) The motion is one of pure rolling
(ii) Pressure angle does not change during contact
(iii) Velocity ratio does not change
(iv) Output torque of the driven gear changes
Which of the above statements are correct?
(a) 1 and 2 (b) 2 and 4
(c) 2 and 3 (d) 3 and 4