(1) An overtime payment is a kind of payment not included in salary.
(2) A payment is an overtime payment if it is:
(a) a payment, however described, for overtime that has been undertaken; or
(b) a commuted overtime payment to all employees within a class of employees; or
(c) a payment to an employee for all of the employee's overtime work regardless of its length or frequency; or
(d) any other payment instead of a payment for overtime.