(a) Any person desiring to participate as a party or witness at the hearing shall notify the person named in the notice of hearing, as prescribed in the notice of hearing, on or before the date specified in the notice of hearing. A person may be both a party and a witness.

(b) The notification must clearly state whether the interested person is participating at the hearing as a party, witness, or both.

(c) If a party or witness will be participating with or through a representative or counsel, the notification must so state and provide the name of the representative or counsel.

(d) Persons who fail to comply with this section and any specified instructions in the notice of hearing shall be deemed to have waived their right to participate in the hearing. Failure to comply with this section shall result in the exclusion of any filed written testimony.