(a) The presiding officer may question witnesses.
(b) Any witness may be accompanied by counsel.
(c) Any party may be accompanied by counsel and either the party or counsel may -
(1) Question witnesses, provided the questions are relevant and material to the matters under investigation and would not unduly impede the progress of the investigation; and
(2) Make objections on the record and argue the basis for such objections.
(d) Copies of all notices or written communications sent to a party or witness must, upon request, be sent to that person's attorney of record.