What is the chronological sequence of the following events in Indian Science scene ?
1. Launching of Rohini-I satellite.
2. Pokhran nuclear test.
3. Start of Indian Space Research Organisation.
4. First unit of Kalpakkam nuclear powers station going critical
Choose the correct answer from the codes given below :
(a) 1, 2, 4 and 3
(b) 2, 3, 4 and 1
(c) 3, 2, 1 and 4
(d) 4, 1, 3 and 2
