(a) The bonds shall be executed by the facsimile signature of the Chair of the Arkansas Economic Development Council and by the manual signature of the Director of the Arkansas Economic Development Commission.
(b) Interest coupons attached to the bonds shall be executed with the facsimile signature of the chair.
(c) Delivery of the bonds and coupons so executed shall be valid notwithstanding any change in persons holding such offices occurring after the bonds have been executed.