During the investigation of an alleged compliance failure:
(A) Unless provided otherwise by this chapter, service upon the staff may be made by ordinary or certified United States mail, by courier service, by facsimile transmission, or by personal service upon the coordinator.
Service is effective upon receipt except that service by United States mail is complete upon mailing and service by facsimile transmission is complete upon transmission.
(B) Service upon the participants shall be made by ordinary or certified United States mail, by courier service, by facsimile transmission, by electronic mail, or by personal service. Service is effective upon receipt by any person, except that service by ordinary or certified United States mail is effective upon mailing and service by facsimile transmission or email is complete upon transmission. Service by email may be made only if the person to be served has consented to receive service by email. Service upon the participants by ordinary or certified United States mail shall be made at any of the following:
(1) If the participant is a natural person at the address listed on the inquiry report.
(2) If the participant is other than a natural person:
(a) If the participant has provided any information to the staff or to the committee, at the address indicated in this communication.
(b) If the participant wants to have notices or requests for inquiries served at a particular address, the participant may contact the commission and request service at such a specific address.
(c) If the participant is a business entity, and whose address is not otherwise disclosed, at any business address of the participant.
(C) Once a participant has filed a written application for reconsideration with the commission in accordance with section 4913.25 of the Revised Code, any further service shall be made in accordance with Chapter 4901-1 of the Administrative Code.