Define a class Student which extends Person defined in class. It adds the attributes

Int Test1, test2, test3

Double average

String grade

Define a constructor which takes all the attributes of person and uses a default value of 0 for the test scores, unknown for grade and 0 for aversge. It has methods computeaverage() and calculategrade(). The grades are based on the average, with above 92 an A, 85 to 92 a B, 70 to 85 a C, 60 to 70 a D etc. Grades only has a getter. All other attributes have a setter and a getter.