If, by its own inquiries or as a result of complaints, the insurance department has any reason to believe that a person has engaged in, or is engaging in, any criminal activity or any violations involving title XXXVII, it may administer oaths, serve subpoenas ordering the attendance of witnesses or production of material, and collect evidence. Service of such subpoenas and subpoenas duces tecum may be made by:
I. Delivering a duly executed copy to the person to be served or an agent authorized by law to receive service of process;
II. Delivering a duly executed copy to the person's principal place of business or abode in this state, if any; or
III. Mailing a duly executed copy via registered mail, return receipt requested, to the person to be served, or an agent authorized by law to receive service of process.