"Spouse" means the husband or wife to whom the member is
validly married under the laws of this state at the time of the
approval by the board of an application for retirement or at the
time of the approval of a later exercise by such member of an
option [...]
"Spouse" means the husband or wife to whom the member is
validly married under the laws of this state at the time of the
approval by the board of an application for retirement or at the
time of the approval of a later exercise by such member of an
option [...]