Q. Which is the correct chronological sequence of the major events given below ?1. SLV-3 Launch.2. Formation of Bangladesh.3. Sikkim becomes 22 nd State of the Indian Union.4. Pokharan-I test. Select the correct answer using the code given below : 

1. 2-4-3-1
2. 3-1-2-4
3. 2-1-3-4
4. 3-4-2-1