what is the possible output of following syntax php v strtolower..., PHP String Operation, PHP

Question:What is the possible  output of the following syntax?
<?php
$v=strtolower("http://WWW.GOOGLE.COM");
echo $v;
?>

A http://www.google.com 
B http://WWW.GOOGLE.COM 
C http://google.com 
D WWW.GOOGLE.COM

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Question:What is the possible output of the following syntax? <?php $v=strtolower("http://WWW.GOOGLE.COM"); echo $v; ?>