The bonds and the coupons, if any, attached to such bonds, must be executed manually or by facsimile in the name of Clemson in such manner and by such persons as the trustees shall from time to time determine, and the seal of Clemson must be affixed to, or impressed, or reproduced on each bond. Any coupons attached to such bonds must be authenticated by the facsimile signature of one or more of the persons signing the bonds. Such bonds may, in the discretion of the trustees, be registerable as to principal and interest on books kept therefor by or on behalf of Clemson, including by a corporate registrar. The delivery of the bonds so executed are valid notwithstanding changes in officers or in the seal occurring after such execution. Notwithstanding the foregoing, the bonds may, in the discretion of the trustees, be issued as fully registered, noncertificated, book-entry securities.