ICE CREAM :) AND CANDY ON TOP IS GREAT Why is the amendment process in the Constitution an example of federalism?

It takes place at the federal level with input from Americans willing to travel to the nation's capital.
It takes place at the state level, but federal officials from each branch of government have to approve it.
It specifies that each amendment must be ratified first by the states and then proposed by Congress.
It requires cooperation between the state and national governments to ratify an amendment.

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