; or (2) if a plan developed by such commission is not enacted into law, the redistricting plan developed and enacted into law by a 3-judge court of the United States District Court for the District of Columbia, in accordance with section 3301. (b) Conforming amendment Section 22(c) of the Act entitled An Act to provide for the fifteenth and subsequent decennial censuses and to provide for an apportionment of Representatives in Congress , approved June 18, 1929 ( 2 U.S.C. 2a(c) ), is amended by striking in the manner provided by the law thereof and inserting: in the manner provided by the Redistricting Reform Act . B Independent Redistricting Commissions 3201. Independent redistricting commission (a) Appointment of members (1) In general The nonpartisan agency established or designated by a State under section 3204(a) shall establish an independent redistricting commission for the State, which shall consist of 12 members appointed by the agency as follows: (A) The agency shall appoint 4 members on a random basis from the majority category of the approved selection pool (as described in section 3202(b)(1)(A)). (B) The agency shall appoint 4 members on a random basis from the minority category of the approved selection pool (as described in section 3202(b)(1)(B)). (C) The agency shall appoint 4 members on a random basis from the independent category of the approved selection pool (as described in section 3202(b)(1)(C)). (2) Appointment of alternates to serve in case of vacancies At the time the agency appoints the members of the independent redistricting commission under paragraph (1) from each of the categories referred to in such paragraph, the agency shall, on a random basis, designate 2 other individuals from such category to serve as alternate members who may be appointed to fill vacancies in the commission in accordance with paragraph (3). (3) Vacancy If a vacancy occurs in the commission with respect to a member who was appointed from one of the categories referred to in paragraph (1), the nonpartisan agency