James Madison Referred to the System of Federalism as the "Middle

James Madison referred to the system of federalism as the "middle ground" of government types. What did he mean by this statement?

A) The federal system is very weak because it fails to establish itself in contrast to unitary and confederation systems.
B) Unitary systems and confederation systems are opposing ends of the continuum. Federalism has elements of both systems but is the best attempt to balance the powers and needs of the state versus federal governments.
C) The government fails to take a definitive stance.
D) Federalism is the second most preferred system of government, after the unitary system.
E) The federal system abolishes the individual powers of the central and state governments in favor of a weaker, but more balanced, hybrid government.