An oral hearing shall be held in the sole discretion of the Hearing Official. An oral hearing includes an in-person hearing, a telephonic hearing, or a hearing by video conference. When the Hearing Official determines that an oral hearing shall not be conducted, the decision shall be based solely on written submissions. The Hearing Official shall arrange for the recording and transcription of an oral hearing, which shall serve as the official record of the hearing. The unexcused absence of a party at the time and place set for hearing may not be occasion for delay at the discretion of the Hearing Official. In the event of such absence, the hearing may proceed without the participation of the absent party.