(a) After the bonds are issued and executed, they shall be submitted to the attorney general for approval.
(b) If the attorney general finds that the bonds are issued according to law and are valid, binding obligations of the district, he shall officially certify the bonds and execute a certificate, which shall be filed with the comptroller and recorded in the book kept for that purpose.

(c) The bonds may not be registered with the comptroller until 20 days after the day of the election authorizing the issuance of the bonds.