Notice of a hearing held by the Commissioner or the hearing officer under the provisions of sections 105 and 106 of this title, shall state the place, day, and hour thereof, and warn the petitioner that he or she may then appear through himself, herself, or counsel. Service of such notice shall be sufficient if sent by first class mail to the address given by the petitioner at least five days before the day set for the hearing. (Amended 1977, No. 260 (Adj. Sess.), § 2, eff. April 19, 1978; amended 1997, No. 55, § 4, eff. June 26, 1997.)