Consider the following statements:

When two gears are meshing, the clearance is given by the 1). difference between dedendum of one gear and addendum of the mating gear 2). difference between total and the working depth of a gear tooth 3). distance between the bottom land of one gear and the top land of the mating gear 4). difference between the radii of the base circle and the dedendum circle Which of these statements are correct?

(a) 1,2 , and 3

(b) 2,3 , and 4

(c) 1,3 , and 4

(d) 1,2 , and 4 .