Section 13-565. Retired employees; change of options

a. A beneficiary shall
  be permitted to change an optional selection as provided in subdivisions
  b and c of this section.
    b. A change of optional selection may be made by a twenty-year pension
  plan retiree having a deferred payability date pursuant to  paragraph  d
  of  subdivision  four  of  section  13-545  of this chapter (relating to
  change of conditional elections by such retirees) and subdivision  c  of
  section  13-558 of this chapter (relating to change of elections by such
  retirees).
    c. If the survivor beneficiary nominated under option  two,  three  or
  four  of  section  13-558  of  this  chapter  is a spouse of the retired
  member, and such person by causes other than death ceases to be  his  or
  her  spouse  or  is  separated  from  him  or her, or if such option was
  selected in contemplation of marriage which has not  taken  place,  then
  the  board  of estimate shall have authority to permit the change of the
  optional benefit to the maximum benefit that is the actuarial equivalent
  by and with the consent of all parties.