(a) Bonds bearing the signatures of officers in office on the date of the signing thereof shall be valid and binding obligations notwithstanding that before the delivery thereof and payment therefor any or all the persons whose signatures appear thereon have ceased to be officers of the County.
(b) The validity of the bonds shall not be dependent on nor affected by the validity or regularity of any proceedings relating to the planning, acquisition, purchase, construction, reconstruction, improvement, betterment, or extension of the sewerage system for which the bonds are issued. The ordinance authorizing the bonds may provide that the bonds shall contain a recital that they are issued pursuant to this chapter, which shall be conclusive evidence of their validity and of the regularity of their issuance.