Design a TestScores class that has member variables to hold three test scores. The class should have aconstructor, accessor/getter, and mutator/setter functions for the test scores, and a member function that returns the average of the test scores. Demonstrate the class by writing a separate program that creates aninstance of the class. The program should ask the user to enter three test scores, which are stored in the
TestScores object. Then the program should display the average of the scores, as reported by the TestScoresobject. The average should be calculated in a separate private function.