; and (B) establishes applicable detection methods and relevant thresholds. (2) Update The Administrator may update, in whole or in part, the schedule required under subparagraph (A) of paragraph (1) in accordance with that paragraph. (3) Early adoption The Administrator may, in accordance with the policy described in section 103(a) and after a period of notice and opportunity for public comment, finalize a rule before the rule required under paragraph (1) that— (A) establishes a schedule for the phaseout or banning of releases of individual perfluoroalkyl or polyfluoroalkyl substances, mixtures of perfluoroalkyl or polyfluoroalkyl substances, or subclasses of perfluoroalkyl or polyfluoroalkyl substances above the threshold of detection described in subsection (a) by the date described in that subsection