$13.$What will be the output of the given code?class Alligator $\{$ public static void main$($String$[]$ args$)\{$ int $[]$x$[]=\{\{1,2\},\{3,4,5\},\{6,7,8,9\}\}$; int $[][]$y $=$ x; System.out.println$($y$[2][1])$; $\}\}$