A federal system of government is one in which the national government has supreme or sovereign authority over the states. Hence, Option D is correct.
What is a sovereign authority?
A political notion known as "sovereignty" designates absolute power or supreme authority. In a monarchy, the "sovereign," or king, holds absolute power. In contemporary democracies, the people themselves exercise their sovereign authority through representative entities like the Congress and the Parliament.
Following are the several categories into which state sovereignty can be divided: Crown Sovereignty. Sovereignty both inside and outside. Political and legal independence. The terms "sovereign" and "independent" refer to a ruler with unrestricted authority.
Thus, Option D is correct.
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