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

$1$ public class Test $\{$

$2$ private int age;

$3$

$4$ public $?$ int square$($int n$)\{$

$5$ return $*$ n;

$6\}$

$7$

$8$ public? int getAge$()\{$

$9\}$

$10\}$

A$)$ in line $8$

C$)$ in both line $4$ and line $8$

B$)$ in line $4$

D$)$ none

A

$$

$$

D