Option A is correct. In a federal system, power is distributed between the central government and the states. There can be disputes about the division of power or interpretation of the Constitution.
An independent judiciary acts as an impartial umpire to settle these disputes and uphold the Constitution. It ensures that both the central government and the states function within their constitutional boundaries.The other options, while relevant to Indian polity, are not exclusive to federal systems Option B is incorrect. The Union Legislature having elected representatives from constituent units is a common feature in both federal and some unitary states with devolved power. Option C is incorrect. The Union Cabinet having elected representatives from regional parties is not a defining characteristic of federalism. Political party affiliation doesn't necessarily determine the federal structure. Option D is incorrect. The Fundamental Rights being enforceable by Courts of Law, while essential for a democracy, this feature exists even in some non-federal states.