What will be the output of the following PHP code?<?phpfunction

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What will be the output of the following PHP code?

<?php
function calc1(&$n)
{
    $n += 7;
}
function calc2(&$n)
{
    $n += 8;
}
$OrignalNumber = 12;
calc1( $OrignalNumber );
echo "Original Number is $OrignalNumber\n";
calc2( $OrignalNumber );
echo "Original Number is $OrignalNumber\n";
?>

1. Original Number is 27
  Original Number is 19
2. Original Number is 12
  Original Number is 19
3. Original Number is 19
  Original Number is 27
4. Original Number is 15
  Original Number is 12
5. None of these

Correct Option: C

calc2() passes value of the variable by reference.