java programming   2.a) Write an abstract class Student describing (students) (2 properties and 1 method)! (Be carefull when defining the method!)                                                                                                                                                                                                               2.b) Extend the Student class into three new classes that can be directly instantiated: UndergraduateStudend, PostgraduateStudent, FailedStudent (each should have one additional property)!                                                                                                          2.c) Use all appropriate classes in a special School class!

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