((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 21102 of this title

((b)) ** Deadlines** The Commission shall adopt the recommendations under this section not later than—

((1)) in the case of the recommendations with respect to , ;

((2)) in the case of the recommendations with respect to , ; and

((3)) in the case of the recommendations with respect to , .

((c)) ** Quadrennial update** The Commission shall review and update recommendations adopted with respect to no less frequently than once every 4 years.section 21081 of this title