(a) Any investigation, inquiry, or hearing which the commission has power to undertake or hold may be undertaken or held by or before any commissioners or examiners designated for that purpose by the commission.
(b) The evidence in any investigation, inquiry, or hearing may be taken by any commissioner, or commissioners, or examiners to whom the investigation, inquiry, or hearing has been assigned.
(c) Every finding, opinion, and order made by a commissioner, or commissioners, or examiners, when approved or confirmed by the commission, shall be the finding, opinion, and order of the commission.