(a) The bonds may be additionally secured by a mortgage, deed of trust lien, or security interest in a designated system of the issuer's governing body and all property and rights appurtenant to the system.
(b) The mortgage, deed of trust lien, or security interest may give the trustee the power to operate the system, sell the system to pay the debt, or take any other action to secure the bonds.
(c) A purchaser at a sale under a mortgage or deed of trust lien is the absolute owner of the system and rights purchased.