Which of the following is a true statement?

1.The judicial branch has the authority to examine acts of the legislative branch but not the executive.

2.The legislative branch of the U.S. government cannot change laws that have been interpreted by Congress.

3.The preemption doctrine holds that the U.S. Congress can override Supreme Court decisions by a 3/4s vote.

4.The Supremacy Clause of the U.S. Constitution means that the Constitution and all laws passed pursuant to the Constitution are the supreme law of the land.