The correct answer is option 1.Indian FederalismIndia is a federal system but with more tilt toward a unitary system of government.It is sometimes considered a quasi-federal system as it has features of both a federal and a unitary system.Article 1 of the Indian Constitution states, India, that is Bharat, shall be a union of states.The word federation is not mentioned in the constitution.The supremacy of the constitution. The constitution is the supreme law in India.Federal Features of the Indian Union-Governments at two-level centres and states.Single citizenshipThere are three lists given in the Seventh Schedule of the Constitution which give the subjects each level has jurisdiction in-Union ListState ListConcurrent ListThe basic structure of the constitution is indestructible as laid out by the judiciary, the constitution is the supreme law in India.Independent judiciary the constitution provides for an independent and integrated judiciary.States are given unequal representation in the Rajya Sabha on the basis of population. Hence, the membership varies from 1 to 31 for a different states. Residuary powers (Article 248) vest with the Centre.The Indian federation is not the result of an agreement among the states, unlike the American federation. Hence, Option 1 is correct.