Consider the following statements in case of reverted gear train:

1). The direction of rotation of the first and the last gear is the same 2). The direction of rotation of the first and the last gear is opposite 3). The first and the last gears are on the same shaft 4). The first and the last gears are on separate but co-axial shafts.

Which of these statements is/are correct?

(a) 1 and 3

(b) 2 and 3

(c) 2 and 4

(d) 4 alone.