(a) The following persons are exempt from licensure under the provisions of this article:
(1) Any employee of a person or firm, when such employee is engaged in the practice of land surveying exclusively for the person or firm, by which employed, or, if a corporation, its parents, affiliates or subsidiaries, and such person, firm, association or corporation does not hold himself, herself or itself out to the public as being engaged in the business of land surveying.