I. The bond of each sheriff shall be in a sum not to exceed $20,000, and that of each county attorney in a sum not less than $5,000.
II. Other county officers shall be bonded as follows:
(a) Each treasurer, and each register of deeds and his deputy shall be bonded in a sum not less than $20,000 nor more than $300,000; and
(b) Each county commissioner shall be bonded in a sum not less than $5,000.