3. The excerpts below are from the Constitution of the United States. Article I Section 1 All legislative powers __ shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives. Article II Section 1 The executive power shall be vested in a President of the United States of America __ together with the Vice President, chosen for the same term. Article III Section 1 The judicial power of the United States, shall be vested in one Supreme Court, and in lother lower] courts as the Congress may from time to time ordain and establish __ Which important constitutional principle is illustrated by these excerpts? A. federalism B. individual rights C. popular sovereignty D. separation of powers