(b) Upon the receipt of a challenge, the clerk of the county commission shall mail a notice of challenge to the registrant, setting forth that the voter's registration will be canceled if the voter does not appear in person during business hours at the clerk's office within a period of thirty days from the mailing of the notice and present evidence of his or her eligibility. The form of the notice of challenge shall be prescribed by the secretary of state and shall be mailed by certified mail, return receipt requested.
(c) If the notice of challenge is returned as undeliverable at the registration address, or if the challenged registrant does not appear and present evidence of continued eligibility within the prescribed time, the voter's registration shall be immediately canceled. Returned mail or failure to appear shall be prima facie evidence of the registrant's ineligibility. If the registrant does timely appear and present evidence of his or her eligibility, the clerk shall determine eligibility to be registered as a voter as in any other case. If the reason for ineligibility is that the voter does not reside at the address on the registration and the voter presents evidence of residence elsewhere in the county, the clerk of the county commission shall accept a request for change of address and remove the challenge.