(

a) Notwithstanding any other provision of law, in any county or district first subject to the provisions of

Section 31676.1 or 31695.1 on or after July 1, 1969, having members performing the duties of safety members as defined in Sections 31470.2 and 31470.4, if the board of supervisors adopts this

section and as to those members adopts or has already adopted the provisions of this article, then the retirement allowance of those safety members shall be computed according to the applicable provisions of this subdivision, as selected by the board of supervisors.

(1) The retirement allowance shall be computed according to the provisions of

Section or 31664.1, and federal old age and survivors’ insurance coverage shall be on an additive or supplemental basis.

(2) If

Section applies, the retirement allowance shall equal the total of both of the following: (

A) The retirement allowance for service rendered prior to the effective date of the resolution specified in

Section shall be computed in accordance with the provisions of

Section 31664. (

B) The retirement allowance for service performed after the effective date of the resolution shall equal the total of both of the following: (

i) The fraction of one seventy-fifth of the first three hundred fifty dollars ($350) monthly of the member’s final compensation set forth in the table appearing in

Section in the column applicable to his or her age at retirement taken to the preceding completed quarter year multiplied by the number of years of creditable service as provided in that section. (ii) The fraction of one-fiftieth of any remaining portion of the member’s final compensation set forth in the table appearing in

Section in the column applicable to his or her age at retirement taken to the preceding completed quarter year multiplied by the number of years of creditable service.

(3) If

Section 31664.1 applies, the retirement allowance shall equal the total of both of the following: (

A) The retirement allowance for service rendered prior to the effective date of the resolution specified in

Section shall be computed in accordance with the provisions of

Section 31664.1. (

B) The retirement allowance for service rendered after the effective date of the resolutions shall equal the total of both of the following: (

i) The fraction of one seventy-fifth of the first three hundred fifty dollars ($350) monthly of the member’s final compensation set forth in the table appearing in

Section 31664.1 in the column applicable to his or her age at retirement taken to the preceding completed quarter year multiplied by the number of years of creditable service as provided in that section. (ii) Three percent of any remaining portion of the member’s final compensation set forth in the table appearing in

Section 31664.1 in the column applicable to his or her age at retirement taken to the preceding completed quarter year multiplied by the number of years of creditable service. (

b) Notwithstanding any other provision of law, in counties which have adopted the provisions of this

section and have voted to apply the provisions of this

chapter relating to safety members as provided by

Section 31695.1, the retirement benefits as well as the contributions of eligible members subject to this

article who do not elect pursuant to

Section 31695.2 to come under the safety member provisions of this chapter, shall be the same as the retirement benefits and contributions of members other than safety members in the county. (

c) The retirement allowance for any safety member who is not subject to this

article shall be computed in accordance with the provisions of

Section 31664. (

d) Any member who becomes a safety member after the effective date of the selection of the method of computing the retirement allowance by the board of supervisors shall be subject to that selection and to the provisions of this article. (

e) Any member subject to the selection described in subdivision (

d) made by the board of supervisors may elect deferred retirement pursuant to

Article 9 (commencing with

Section 31700).