(1) Such member renders five or more years of service in the employ of the state after such entry or reentry, or

(2) Immediately prior to service with the state, service was rendered while a member of a retirement system maintained by the state or a municipality thereof, operating on a sound actuarial basis and subject to the supervision of the department of financial services of this state, in a plan which provides service retirement benefits equal or superior to those provided under this section and at the date of his retirement such member would have been eligible for such benefits had he not separated from service with such employer. d. A member eligible for a vested retirement allowance pursuant to the provisions of section seventy-six of this chapter who separates from the employ of the state on or after April first, nineteen hundred seventy with twenty or more years of total service, and who would have been eligible to have his retirement allowance computed pursuant to the provisions of this section had he at the time of separation attained age fifty-five, shall at the time he becomes eligible to receive the vested retirement allowance be entitled to have such allowance computed in the manner prescribed by this section. e. A member in the employ of the state on March thirty-first, nineteen hundred seventy shall be entitled to have his retirement allowance computed on the basis of the provisions of section seventy-five-f of this chapter if a greater benefit would have been provided under such provisions. f. The benefits hereinabove provided shall be payable to a member, including a member covered by the provisions of section eighty-nine of this article who is not in the negotiating unit designated as the security services unit and established pursuant to article fourteen of the civil service law, unless such member would otherwise be entitled to a greater benefit under such other provisions of this article, in which event such greater benefit shall be payable. g. The provisions of this section shall apply to members retiring or separating in vested status from state service on or after April first, nineteen hundred seventy.