(a) Registered Interior Designers duly registered in Texas are authorized to use the title "registered interior designer" to describe themselves.(b) A firm, partnership, corporation, or other business association may use the title "registered interior designer" only under the following conditions:(1) The business employs at least one Registered Interior Designer on a full-time basis or associates with at least one Registered Interior Designer pursuant to the provisions of §5.132 of this title (relating to Association); and(2) The Registered Interior Designer(s) employed by or associated with the business pursuant to paragraph (1) of this subsection exercise Supervision and Control over all Interior Design services performed by Nonregistrants on behalf of the business.(c) No entity other than those qualified under subsections (a) and (b) of this section may use the title "registered interior designer" in its name.(d) A person participating in an internship to complete the experiential requirements for Interior Design registration in Texas may use the title "registered interior design intern."