Explanation:

- Option 1: President

- The President of India is the ceremonial head of state and does not hold the position of the ex-officio chairman of the NITI Aayog.

- Option 2: Prime Minister

- The Prime Minister of India is the ex-officio chairman of the NITI Aayog. This aligns with the organization's governance structure, where the Prime Minister plays a pivotal role in setting and guiding policies.

- Option 3: Vice President

- The Vice President of India primarily presides over the Rajya Sabha and does not hold the position of ex-officio chairman of the NITI Aayog.

- Option 4: Finance Minister

- The Finance Minister is responsible for the country's economic policies and budget but is not the ex-officio chairman of the NITI Aayog.

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