The Person, Student and Teacher classes have the following instance variables, methods, and inheritance relationship:

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) { ... } // implementation omitted
    public String getName() { ... } // implementation omitted
    public int getAge() { ... } // implementation omitted
}

public class Student extends Person {
    private int grade;
    private double gpa;

    public Student(String name, int age) { ... } // implementation omitted
    public void setGrade(int grade) { ... } // implementation omitted
    public void setGPA(double gpa) { ... } // implementation omitted
    public int getGrade() { ... } // implementation omitted
    public double getGPA() { ... } // implementation omitted
}

public class Teacher extends Person {
    private String[] classesTaught;

    public Teacher(String name, int age) { ... } // implementation omitted
    public void addClass(String className) { ... } // implementation omitted
    public String[] getClassesTaught() { ... } // implementation omitted
}

Assume we have a Person object person, a Student object student, and a Teacher object teacher

Which of the following is a valid instruction?

1. Correct Answer
   Incorrect Answer
   a

   person.setGrade(10);

   Java
2. Correct Answer
   Incorrect Answer
   b

   teacher.setGPA(3.5);

   Java
3. Correct Answer
   Incorrect Answer
   c

   student.addClass("Algebra 1");

   Java
4. Correct Answer
   Incorrect Answer
   d

   String name = teacher.getName();

   Java
5. Correct Answer
   Incorrect Answer
   e

   int age = student.age;

   Java