If the document is . . . | Service may be made by . . . |
(i) An appeal under § 4.470 | (A) Personal delivery; |
| (B) Registered or certified mail, return receipt requested; |
| (C) Delivery service, delivery receipt requested, if the last address of record is not a post office box; or |
| (D) Electronic transmission, if the person to be served has previously consented to that means of service in writing. |
(ii) A complaint under § 4.450-4 or 4.451-2 | (A) Any of the methods specified in paragraph (c)(4)(i) of this paragraph; or |
| (B) Publication as specified in § 4.450-5 . |
(iii) Neither an appeal nor a complaint | (A) Personal delivery; |
| (B) Mail; |
| (C) Delivery service, if the last address of record is not a post office box; or |
| (D) Electronic transmission, if the person to be served has consented to that means in writing. |