Question 5: Consider the code given below. Choose the correct option.

1class Person {
2    public void work() {
3        System.out.println("works as a person.");
4    }
5}
6class Teacher extends Person {
7    public void work() {
8        System.out.println("Works as teacher.");
9    }
10    public void grade() {
11        System.out.println("Grading papers.");
12    }
13}
14class MathTeacher extends Teacher {
15    public void solveEquation() {
16        System.out.println("Solving complex equations.");
17    }
18}
19public class SchoolTest {
20    public static void main(String[] args) {
21        Teacher t = new MathTeacher();  // LINE 1
22        t.work();
23        t.grade();  // LINE 2
24        t.solveEquation();  // LINE 3
25    }
26}