What will be the value of the variable $input in the following

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What will be the value of the variable $input in the following PHP code?

<?php
$input = "Ajit<td>Gupta</td>you are really<i>Handsome</i>!";
$input = strip_tags($input,"<i></i>");
?>

1. Error
2. Ajit Gupta you are really Handsome!
3. Ajit Gupta you are really Handsome
4. Nothing
5. None of these

Italic tags <i></i> might be allowable, but table tags <td></td> could potentially wreak havoc on a page.