(1) All faculty members who are first employed by an institution of higher education in a position eligible for participation in old age annuities or retirement income plans under chapter
28B.10 RCW on or after July 1, 2011, have a period of thirty days to make an irrevocable choice to:
(a) Become a member of the teachers' retirement system plan 3 under this chapter; or
(b) Participate in the annuities or retirement income plan provided by the institution.
(2) At the end of thirty days, if the member has not made a choice to become a member of the teachers' retirement system, he or she becomes a participant in the institution's plan under RCW
28B.10.400, but does not become eligible for any supplemental benefit under RCW
28B.10.400(1)(c).