The secretary of state will work with each county auditor to identify the most cost effective U.S. Postal Service business reply permit type for their county. Once the appropriate business reply mail permit type is determined, each county auditor must:

(1) Establish and maintain the U.S. Postal Service business reply mail permit identified and use it exclusively for ballot return postage; and

(2) Use ballot return envelopes approved by the U.S. Postal Service for the business reply mail permit established in subsection (1) of this section.