Sec. 21. The bonds, notes, or other evidences of indebtedness payable from revenues:
(1) shall, except as provided in subdivision (4), be sold at public sale as provided by general statutes concerning the sale of bonds;
(2) may be sold at different times or an entire issue or series may be sold at one (1) time;
(3) may be sold:
(A) in part; or
(B) in part in installments at different times or at one (1) time; and
(4) may be sold or issued to the United States or the state without a public offering.