Modify the student class presented as follows. each student object should also contain the scores for three tests. provide a constructor that sets all instance values based on parameter values. overload the constructor such that each test score is assumed to be initially zero. provide a method called settestscore that accepts two parameters: the test number (1 through 3) and the score. also provide a method called gettestscore that accepts the test number and returns the appropriate score. provide a method called average that computes and returns the average test score for this student. modify the tostring method such that the test scores and average are included in the description of the student. create a class with main method to exercise the new student methods. public class student { private string firstname, lastname; private address homeaddress, schooladdress; // // sets up this student object with the specified initial values. // public student (string first, string last, address home, address school) { firstname