Consider two shafts connected with two gears as per the following options:
1. One on each shaft
2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only.
3. Through an intermediate gear mounted on an intermediate shaft. With intermediate shaft having two gears, whereas the other shafts have one gear each
Which of the above represent(s) a simple gear train?
(a) 1 only (b) 1 and 2only
(c) 2 and 3 only (d) 1,2 and 3 only