What will happen in this function call?<?php function

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What will happen in this function call?

<?php
    function calc($num, $num1)	
    {
        $sum = $num + $num1;
        echo $sum;
    }
$n = 20;
$n1 = 10;
calc($n, $n1);	
?>

1. Call By Reference
2. Type Hinting
3. Call By Value
4. Default Argument Value
5. None of these

Correct Option: C

When you pass an argument in the above manner or say we pass 15 and 3 directly, it is called passing by value or call by value.