What will be the output of below code ? <?php $arr = array(5 => 1, 12 => 2); $arr[] = 56; $arr["x"] = 42; echo var_dump($arr); ?> | PHP

A. 42
B. array(3) { [12]=> int(2) [13]=> int(56) ["x"]=> int(42) }
C. array(4) { [5]=>int(1) [12]=> int(2) [13]=> int(56) ["x"]=> int(42) }
D. 1,2,56,42

Ans: C