$2.$ What follows is a Java program excerpt.

class Circle

$\{$

int setVariable$($int s$)$

$\{$ int r;

r$=6$;

return s$+$r;

$\}$

$\}$

public class ShowArea

$\{$

public static void main$($String args$[])$

$\{$

Circle cir$=$ new Circle$()$;

int a;

a$=$ cir.setVariable$(8)$;

$\}$

$\}$

In the above program,

$($i$)$ which variables are static variables?

$($ii$)$ Which variables are stack dynamic variables?

$($iii$)$ And which variables are explicit$-$heap dynamic variables?