Which among the following statements is/are correct?
1. There are 543 constituencies in India and this number has not changed since 1969.
2. The legislature in the parliamentary system ensures executive accountability at various stages through "Deliberation and discussion" as one of the devices.
3. Bicameral legislature exists in six states of India.
4. The elected members of the State Legislative Assembly elect the members of the Rajya Sabha.
1. 2, 3 and 4 only
2. 3 and 4 only
3. 1, 3 and 4 only
4. All are correct