(a) Except as provided in Paragraph (d) of this article, a peace officer shall serve a summons on a corporation by personally delivering a copy of it to the corporation’s registered agent. However, if a registered agent has not been designated, or cannot with reasonable diligence be found at the registered office, then the peace officer shall serve the summons by personally delivering a copy of it to the president or a vice-president of the corporation.
(b) If the peace officer certifies on the return that he diligently but unsuccessfully attempted to effect service under Paragraph (a) of this article, or if the corporation is a foreign corporation that has no certificate of authority, then he shall serve the summons on the secretary of state by personally delivering a copy of it to him, or to the deputy secretary of state, or to any clerk in charge of the corporation department of his office. On receipt of the summons copy, the secretary of state shall immediately forward it by certified or registered mail, return receipt requested, addressed to the defendant corporation at its registered or principal office in the state or country under whose law it was incorporated.

(c) The secretary of state shall keep a permanent record of the date and time of receipt and his disposition of each summons served under Paragraph (b) of this article together with the return receipt.
(d) The method of service on a corporation regulated under the Insurance Code is governed by that code.