what will be the correct output of following syntax php..., PHP Regular Expression, PHP

Question:What will be the correct output of the following syntax?
<?php
        $v="php 6.0";
         echo sql_regcase($v);
?>

A <span>[Pp][Hh][Pp] 6.0</span> 
B [pP][hH][pP] 6.0 
C [Pp][hH][Pp] 6.0 
D [Pp][pP][Hh] 6.0

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Question:What will be the correct output of the following syntax? <?php $v="php 6.0"; echo sql_regcase($v); ?>