§ 89-t. Definitions. For this article, a process server is a person other than an attorney or a party to an action acting on his own behalf who: (a) derives income from the service of papers in an action; or (b) has effected service of process in five or more actions or proceedings in the twelve month period immediately preceding the service in question. A person who serves interlocutory papers upon an attorney or who serves papers on behalf of a federal, state or local governmental agency in the course of his employment by such agency shall not be deemed a process server within the meaning of this article by virtue of such service.