ree 53. Write a program that determines a student's grade. It reads thr scores (between 0 and 100) and calls a function that calculates returns a student's grade based on the following rules: a. If the average score is 90% or more, the grade is A. b. If the average score is 70% or more and less than 90%, it checks t third score. If the third score is more than 90%, the grade is A; other wise, the grade is B. C. If the average score is 50% or more and less than 70%, it checks the d. If the average score is less than 50 percent, then the grade is F. subfunctions are required: one to read scores, one to dete average of the second and third scores. If the average of the two i greater than 70%, the grade is c; otherwise, it is D. ram's main is to contain only call statements. At least grade, and one to print the results