Explanation:

- Vice-President

- The Vice-President of India is the ex-officio Chairman of the Rajya Sabha, which is the upper house of the Parliament of India, also known as the Council of States.

- The Vice-President presides over the sessions of the Rajya Sabha.

- CORRECT ANSWER: Vice-President

- Leader of the Opposition

- This person is the head of the largest political party not in government in the Rajya Sabha.

- They hold a role in critiquing the government from the opposition standpoint but are not involved in chairing sessions.

- President

- The President of India is the ceremonial head of state.

- They do not preside over the sessions of any of the Houses of Parliament.

- Speaker

- The Speaker presides over the Lok Sabha, which is the lower house of Parliament.

- The Speaker does not have any formal role in the functioning of the Rajya Sabha.