(a) The registered agent of a foreign corporation authorized to transact business in this state is the corporation's agent for service of process, notice or demand required or permitted by law to be served on the foreign corporation.
(b) A foreign corporation may be served by registered or certified mail, return receipt requested, addressed to the secretary of the foreign corporation at its principal office shown in its application for a certificate of authority or in its most recent return required pursuant to section three, article twelve-c, chapter eleven of this code if the foreign corporation:
(1) Has no registered agent or its registered agent cannot with reasonable diligence be served;