What will be the output of the following PHP code? <?php $a1 = array("red", "green"); $a2 = array("blue", "yellow"); print_r(array_merge($a1, $a2)); ?>

Array ( [0] => blue [1] => yellow )

Array ( [0] => red [1] => green)

Array ( [0] => blue [1] => yellow [2] => red [3] => green )

Array ( [0] => red [1] => green [2] => blue [3] => yellow )

What will be the output of the following PHP code? <?php $a1 = array(

1.	What will be the output of the following PHP code? <?php $a1 = array("red", "green"); $a2 = array("blue", "yellow"); print_r(array_merge($a1, $a2)); ?>
A.	Array ( [0] => red [1] => green)
B.	Array ( [0] => blue [1] => yellow [2] => red [3] => green )
C.	Array ( [0] => red [1] => green [2] => blue [3] => yellow )
D.	Array ( [0] => blue [1] => yellow )
Answer» D. Array ( [0] => blue [1] => yellow )