The department shall instruct counties, by means of an all county letter or similar instruction, as to the process that is to be used to ensure that each child, physical custody of whom has been voluntarily surrendered pursuant to Section 1255.7 of the Health and Safety Code, shall be determined eligible for benefits under this chapter for, at a minimum, a period of time commencing on the date physical custody is surrendered and ending on the earliest of the following dates:
(a) The last day of the month following the month in which the child was voluntarily surrendered under Section 1255.7 of the Health and Safety Code.
(b) The date the child is reclaimed under Section 1255.7 of the Health and Safety Code.
(c) The date the child ceases to reside in California.