By what means may the presiding officer issue a notice, order, or decision?

(a) Electronic. A presiding officer's notice, order, or decision may be issued electronically under the terms specified in the OHA Standing Order on WELSA Proceedings. (b) Non-electronic. A presiding officer's notice, order, or decision may be issued non-electronically by U.S. mail or commercial courier to the Project Director or a party in interest using their record address as provided under § 4.22(b) or, if not provided, their last known mailing address.