By resolution of its board of directors, an authority may provide for the issuance of:
(1) Refunding bonds to refund any bonds of the authority that were issued under this subtitle and are outstanding; or
(2) A single issue of bonds to:
(i) Pay the cost of a project or of the improvement, extension, or reconstruction of or additions to a project; and
(ii) Refund bonds that:
1. Were issued under this subtitle and are outstanding; and
2. Have matured, are subject to redemption, or can be retired.