For the following code: Which of the following sequence will run successfully?

For the following code:
<?php

function Expenses()
{
    function Salary()
    {
    }

    function Loan()
    {
        function Balance()
        {
        }
    }
}

?>
Which of the following sequence will run successfully?

Answers:

• Expenses();Salary();Loan();Balance();

• Salary();Expenses();Loan();Balance();

• Expenses();Salary();Balance();Loan();

• Balance();Loan();Salary();Expenses();