Answer all the questions:

B1. Given the following classes, answer the below questions.

1. Person (abstract class) that has the following:

Data Fields: private String name, private String address

Constructor: Constructor to create a Person object with specified name and address.

Methods: Accessor and mutator methods for all data fields.

2. Student (extend the class Person) that has the following:

Data Fields: private int ID, private double grade

Constructor: Constructor to create a Student object with specified name, address, ID & grade.

Methods: Accessor and mutator methods for all data fields.

3. Director (extend the class Person) that has the following:

Data Fields: private double salary.

Constructor: Constructor to create a Director object with specified name, address, and salary.

Methods: Accessor and mutator methods for salary data field.

4. GraduateStudent(extend the class Student) that has the following:

Data Fields: -

Constructor: Constructor to create a GraduateStudent object with specified name,

address, ID, and grade.

Methods: -

Design UML diagram for the above classes.

Write the code only for class Person and Class Student.