(2)
Not later than December 31, 1988, the Secretary shall promulgate final regulations providing for the implementation of—
(A)
the system proposed under paragraph (1)(A)(i), or
(B)
if the changes in law specified pursuant to paragraph (1)(B)(i) have not been enacted, the system described in paragraph (1)(B)(ii).
Such regulations shall provide for the full implementation of the system not later than October 1, 1991.