Which best explains how Article IV is connected to federalism?

Which best explains how Article IV is connected to federalism?

a. Article IV grants powers to states while limiting the powers of the federal government.
b. Article IV grants powers to the federal government while limiting the powers of the states.
c. Article IV grants powers to states while limiting the powers of the executive branch.
d. Article IV grants powers to the federal government while limiting the powers of the judicial branch.