(A) By a proprietary school, licensed by the State of South Carolina; a college, junior college, or university supported entirely or partly by taxation;
(B) By a private college or university which maintains and operates educational programs in which credits are transferable to a college, junior college, or university supported entirely or partly by taxation; or
(C) In a structure:
(1) Which has no sign visible from the exterior of the structure and no other advertising that indicates a nude person is available for viewing; and
(2) Where, in order to participate in a class a student must enroll at least three (3) days in advance of the class; and
(3) Where no more than one (1) nude model is on the premises at any one time.