Write a program that accepts a numerical value x from 0 to 100 as and computes and displays the corresponding letter grade given by the following table input A x ≥ 90
B 80 ≤ x ≤ 89 C 70 ≤ x ≤ 79 D 60 ≤ x ≤ 69 F x< 60 a. Use nested if statements in your program (do not use elseif) to create a function below: function letterGrade convertValueToGrade_a(value) b. Use only elseif clauses in your program to create a function below: function letterGrade convertValueToGrade_b(value) Then, type these sentences below to test your function: (Just copy and paste these sentences below to your code) : a = convertValueToGrade_a(95) b = convertValueToGrade_a(83) c = convertValueToGrade_b(68) d = convertValueToGrade_b(57)