; (II) the National Institute of Standards and Technology; (III) the Federal Trade Commission; (IV) the Federal Communications Commission; and (V) the Consumer Product Safety Commission; and (vi) an expert who shall ensure that, subject to subsection (e), the Advisory Committee conforms to and complies with the requirements under the Federal Advisory Committee Act (5 U.S.C. App.). (C) Limitation In appointing members under subparagraph (A), the Secretary shall ensure that— (i) each interest group described in clauses (i), (ii), (iii), and (v) of subparagraph (B) is proportionally represented on the Advisory Committee, including— (I) businesses of each size described in clause (i) of that subparagraph; (II) Federal employees with expertise in each subject described in clause (v) of that subparagraph; and (III) Federal employees from each agency described in subclauses (I) through (V) of clause (v) of that subparagraph; and (ii) no single interest group described in clauses (i), (ii), (iii), and (v) of subparagraph (B) is represented by a majority of the members of the Advisory Committee. (2) Chair The Secretary shall designate a member of the Advisory Committee to serve as Chair. (3) Pay Members of the Advisory Committee shall serve without pay, except that the Secretary may allow a member, while attending meetings of the Advisory Committee or a subcommittee of the Advisory Committee, per diem, travel, and transportation expenses authorized under section 5703 of title 5, United States Code. (d) Support staff