(a) The county clerk of the county in which a township described in Section 90-5 lies shall be ex officio township clerk and township assessor of each such township, and the treasurer of the county shall be ex officio collector and supervisor of each such township. Those officers shall not be required to give any additional bond on account of holding those township offices, but they shall be liable on their official bonds for their acts as township officers in the same manner and to the same extent as if the bonds had been given the township officers.
     (b) County clerks and county treasurers who become ex officio township officers under this Article shall not maintain any other or different public office as township officers than those provided and maintained for them as county clerk and county treasurer.