Explanation:

- Option 1: The Election Commission of India - A constitutional body established to oversee free and fair elections, mentioned in Article 324.

- Option 2: The Finance Commission - A constitutional body created under Article 280 to define the financial relations between the central government and the states.

- Option 3: The Official Languages Commission - Established under Article 344 for the progressive use of Hindi in official communication, it is constitutional.

- Option 4: The National Commission for Women - Created by an Act of Parliament (The National Commission for Women Act, 1990) and is not a constitutional body.