What is established by Articles 1-3 of the US constitution?

The first three articles of the Constitution establish three branches of government with specific powers: Executive (headed by the President), Legislative (Congress) and Judicial (Supreme Court). Power is separated and shared.

The first three articles establish the three branches of government and their powers: Legislative (Congress), Executive (office of the President,) and Judicial (Federal court system). A system of checks and balances prevents any one of these separate powers from becoming dominant.

i am sure the answer is d