Exp) Option d is the correct answer.

Cooperative Federalism believes in treating states as partners and not merely dependents or beneficiaries of the Union Government.

Option a is incorrect: In Competitive Federalism (not cooperative federalism), the states are seen as dependents of the Union and have to compete among each other in order to receive a bigger share of limited resources.

Option b is incorrect: Cooperative federalism is more a concept and style of administration rather than actual change in legislative domains and respective powers of the Centre and the states, and hence most often no amendment, let alone amendment under Article 368, is required.

Option c is incorrect: Cooperative Federalism is not a way of division of powers between the Centre and the states. It is a concept which involves giving the states a bigger platform to express their needs and contribute ideas on how the Central and respective state governments can ensure maximum progress.

Option d is correct: Cooperative federalism is the horizontal relationship between union and states and shows neither is above the other. Article 261 of the Constitution of India provides that full faith and credit shall be given throughout the territory of India to all the public acts, records, and judicial proceedings of the Union and every State. This is a step to promote cooperation and faith between the centre and the states.