Write a c++ program that will create an array of four integers. it will allow the user to enter in four valid scores and store them in the array. ( valid range is 0 - 100) it will compute the letter grade based upon the four scores, namely, a = 90 - 100, b= 80- 89, c = 70-79, d = 60-69, otherwise f. it will display the scores and letter grade to the screen.