Explanation:

- Option 1: The Rajya Sabha

- The Vice-President of India serves as the ex-officio Chairman of the Rajya Sabha, which is the Upper House of India's Parliament.

- Correct Answer

- Option 2: The National Development Council

- The National Development Council is an advisory body, involving the Prime Minister, Union Ministers, Chief Ministers, and other key figures.

- The Vice-President does not have a formal role here.

- Option 3: The NITI Aayog

- The NITI Aayog is the policy think tank of the Indian government.

- The Prime Minister is the Chairperson, not the Vice-President.

- Option 4: None of the above

- This option would be incorrect as the Vice-President is indeed the ex-officio Chairman of the Rajya Sabha.