What will be the output of the following PHP code ?<?phpdefine('ATTENTION_TEXT',

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What will be the output of the following PHP code ?

<?php
define('ATTENTION_TEXT', 'Interview mania is good website.', true);
echo ATTENTION_TEXt;
$changing_var = 'text';
echo constant('ATTENTION_' . strtoupper($changing_var));
?>

1. Nothing
2. Interview mania is good website.
3. Interview mania is good website.Interview mania is good website.
4. Error
5. None of these

Correct Option: C

echo constant(c) output c, and c here is the concatenation of ATTENTION_ and $changing_var with . operator.