ISSUANCE OF OBLIGATIONS.

(a) The commission may provide that obligations issued under this subchapter are payable annually or semiannually and may issue the obligations in any denominations and may have them mature serially or at one time not more than 40 years from their date.

(b) The obligations shall be signed by the chairman and secretary of the commission, and the interest coupons attached to the obligations may be executed with the facsimile signatures of these officers. The obligations shall be valid and sufficient for all purposes even though the officers whose signatures are on the obligations or coupons cease to be officers before delivery to the purchaser.

(c) Any obligations issued under this subchapter shall be in registered or coupon form, and if the obligations are in coupon form, they may be registered with relation to principal only or with relation to both principal and interest.

(d) The commission may sell the obligations in the manner and at the time which it considers expedient and necessary to the interests of the district.

(e) The commission may make principal and interest on the obligations payable at any place or places inside or outside the State of Texas and may make the obligations redeemable before maturity at the premium determined by the commission.

(f) Each issue of obligations authorized under this subchapter shall constitute a separate series which shall be appropriately designated. These obligations constitute negotiable instruments within the meaning of the negotiable instruments law.