The bonds and coupons, if any, attached to the bonds, are executed manually or by facsimile in the name of Clemson in the manner and by persons as the trustees 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 the bonds must be authenticated by the facsimile signature of one or more of the persons signing the bonds. The bonds, in the discretion of the trustees, may be registerable as to principal and interest on books kept for them by or on behalf of Clemson, including by a corporate registrar. The delivery of the executed bonds is valid notwithstanding changes in officers or in the seal occurring after the execution. Notwithstanding the foregoing, the bonds, in the discretion of the trustees, may be issued as fully registered noncertificated book-entry securities.