IN JAVA Grade Book A teacher has five students who have each taken four tests. The teacher uses the following grading scale to assign a letter grade to a student, based on the average of his or her four test scores: Test Score Letter Grade 90-100 A 80-89 B 70-79 C 60-69 D 0-59 F Write a class that uses a String array or an ArrayList object to hold the five students' names, an array of five characters to hold the five students' letter grades, and five arrays of four doubles each to hold each student's set of test scores. You may find using a single 5x4 multi-dimensional array easier to manage instead of a separate array for each set of test scores. The class should have methods that return a specific student's name, the average test score, and a letter grade based on the average. Although averages are often floating-point values, you should cast the average test score to an integer when comparing with the grading scale. This reduces the possibility of error. Demonstrate the class in a program that allows the user to enter each student's name and his or her four test scores. It should then display each student's average test score and letter grade.