An officer of the district shall sign the bonds for the district. Within 10 days after the sanitary commission submits the bonds to a member county for endorsement, the endorsement of the member county guaranteeing the bond shall be signed by: The clerk or secretary of the governing body of the member county; and The chief executive officer of the member county; or Another officer of the member county authorized by a resolution of the governing body of the member county to sign the endorsement. The validity of a signature or facsimile of a signature made under this section is not affected by the fact that the individual whose signature is on the bond no longer holds the office that authorized the individual to sign the bond, even if the bond is delivered after that individual leaves the office.