(a) In general To assist States in meeting the requirements of part A of this subchapter, the Commission shall adopt voluntary guidance consistent with such requirements in accordance with the procedures described in section 15502 of this title.
(b) Deadlines The Commission shall adopt the recommendations under this section not later than—
(c) Quadrennial update The Commission shall review and update recommendations adopted with respect to section 15481 of this title no less frequently than once every 4 years.