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

1. The question asks for the correct chronological sequence of four major events. 2. Event 2: Formation of Bangladesh occurred in December 1971 following the Bangladesh Liberation War. 3. Event 4: Pokhran-I test (codenamed Smiling Buddha), India's first nuclear test, took place in May 1974. 4. Event 3: Sikkim became the 22nd State of the Indian Union through the 36th Amendment Act, which came into effect in April 1975. 5. Event 1: SLV-3 Launch: The first successful orbital launch of the SLV-3 vehicle carrying the Rohini satellite occurred in July 1980 (earlier attempts failed). 6. The correct chronological sequence is: Formation of Bangladesh (1971) -> Pokhran-I test (1974) -> Sikkim becomes 22nd State (1975) -> SLV-3 Launch (1980). Sequence: 2, 4, 3, 1.