; (B) the date that is the last day of the first regular session of the legislature of the State that begins after the date the Authority makes a determination under subsection (a)(1); or (C) in the case of a State receiving a subsequent determination under subsection (a)(4), the date that is the last day of the first regular session of the legislature of the State that begins after the date the Authority made the determination. (2) Partial failure If the Authority makes a determination that a State does not substantially provide for the rights and responsibilities described in subsection (b) solely because the State law substantially provides for such rights and responsibilities for certain categories of public safety officers covered by the Act but not others, the Authority shall identify those categories of public safety officers that shall be subject to the regulations and procedures described in section 5, pursuant to section 8(b)(3) and beginning on the appropriate date described in paragraph (1), and those categories of public safety officers that shall remain solely subject to State law with respect to the rights and responsibilities described in subsection (b). 5. Role of federal labor relations authority (a) In general Not later than 1 year after the date of enactment of this Act, the Authority shall issue regulations, in accordance with the rights and responsibilities described in section 4(b), establishing collective bargaining procedures for employers and public safety officers in States where the Authority has determined, acting pursuant to section 4(a), do not substantially provide for such rights and responsibilities. (b) Role of the federal labor relations authority The Authority, to the extent provided in this Act and in accordance with regulations prescribed by the Authority, shall— (1) determine the appropriateness of units for labor organization representation