You should add the static keyword in the place of ? in Line ________ in the following code:

Question

```
1 public class Test {
2 private int age;
3
4 public ? int square(int n) {
5 return n * n;
6 }
7
8 public ? int getAge() {
9 }
10}
```
a. in line 4
b. in line 8
c. in both line 4 and line 8
d. none

Answer 1

a The square method should be static because it does not reference any instance data or invoke any instance method.