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

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 return age; 10 } 11} 

Choose one option from the following:

none

in line 4

in line 8

in both line 4 and line 8