(a) The Commissioner shall preside at the hearing and shall keep a true and concise record of the proceedings thereat. Formal rules of pleading or evidence need not be observed in the hearing.
(b) At the expense of and at the written request reasonably made by any person affected by the hearing, the Commissioner shall cause a full stenographic record of the proceedings to be made by a competent stenographic reporter and if transcribed such record shall be made a part of the Commissioner's record of the hearing.
(c) The Commissioner shall allow any person affected by the hearing to be present during the giving of all testimony and shall allow him a reasonable opportunity to inspect all documentary evidence, to examine witnesses, and to present evidence in support of his interest. Upon good cause shown, the Commissioner may permit any person to intervene, appear, and be heard at the hearing.
(d) Any person heard shall make full disclosure of facts pertinent to the subject of inquiry as requested by the Commissioner or by any person affected by the hearing.