If the commissioner has decided the amount of financial assistance that an applicant for the assistance is entitled to receive, the assistance may be given in any of the following ways:
(a) as a single payment, or a series of payments, to the applicant;
(b) as payment of an invoice for, or on behalf of, the applicant;
(c) as a refund of expenditure incurred by, or on behalf of, the applicant;
(d) if the applicant is a child—as a payment to the public trustee and guardian to be held on trust for the applicant.