The correct answer is council-executive.
Executive and legislative power are divided between different offices in the council-executive system.
In the United States, there is a good system of “check and balance” that allow the three powers of the country to maintain balance and to prevent abuse on their powers. There is the Executive branch that is the presidency of the United States, there is the legislative branch that is the House of Representatives and the Senate (The U.S. Congress), and finally, there is the Judicial, the Supreme Court.