which is the correct output for following code php value1 hello..., PHP Variables and Datatypes , PHP

Question:Which is the correct output for the following code?

<?php
 $value1="Hello";
 $value2=& $value1;
 $value2="Jahid";

 echo $value1;
?>

A Hello 
B Jahid 
C Error 
D Hello Jahid

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Question:Which is the correct output for the following code? <?php $value1="Hello"; $value2=& $value1; $value2="Jahid"; echo $value1; ?>