Take the midterm, quiz, and final exam of 5.1 million points, and the average score is 1) A if it is 90 or higher, 2) B if it is less than 90 and 80 or higher, 3) C if it is less than 80 and 70 or higher, 4) Write a program that outputs D if less than 70 and more than 60, 5) F if less than 60.