How are federal judges selected? Select one: O a. They are elected by a popular vote. O b. They are appointed by the President with the consent of the Senate. O c. They are chosen by sitting federal judges. O d. They are appointed by Congress and approved by the President. Which of the following is not one of the three levels of the federal judiciary? Select one: a. U.S. district courts b. U.S. Supreme Court c. U.S. courts of appeal O d. U.S. specialized courts