The constitutional means that is being referred to by Madison is checks and balances. In this Federalist Paper, James Madison expatiates the checks and balances system in the Constitution.
Checks and balances is a principle of government under which separate branches are authorized to prevent actions by other branches and are induced to share power. Checks and balances are applied primarily in constitutional governments.
It is included in the Constitution in order to checkmate the activies of each branch of the government. Each branch of government is designed such that its power checks the power of the other two branches; additionally, each branch of government is dependent on the people, who are the source of legitimate authority.
Therefore, the correct answer is as given above
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