php url http www example com echo strtolower which..., PHP String Operation, PHP

Question:<?php
    $url = "http://WWW.EXAMPLE.COM/";
    echo strtolower($url);
?>
Which of the following is correct output for above Statement ?

A http://www.example.com/ 
B www.example.com 
C http://WWW.EXAMPLE.COM/ 
D WWW.EXAMPLE.COM

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Question:<?php $url = "http://WWW.EXAMPLE.COM/"; echo strtolower($url); ?> Which of the following is correct output for above Statement ?