(a) Before the commission may hear testimony in a contested case, evidence must be placed in the record to show that proper notice of the hearing was given to affected persons.
(b) If mailed notice to an affected person is required, the commission or other party to the hearing shall place evidence in the record that notice was mailed to the affected person's address as shown by the appropriate appraisal district real property appraisal records at the time of the mailing.
(c) The affidavit of the commission employee responsible for the mailing of the notice, attesting that the notice was mailed to the address shown by the appraisal district real property appraisal records at the time of mailing, is prima facie evidence of proper mailing.