; and (ii) if there is no other suitable candidate available, apply to become the representative payee for the child with respect to the benefits; and (C) develop and implement procedures to ensure that any such child who is potentially eligible for, or is a recipient of, benefits under title II or supplemental security income benefits under title XVI, is assisted with applying for such benefits not later than 120 days (or, if the child has attained 17 years of age, 1 year) before the child exits foster care. . (b) GAO study (1) In general Within 4 years after the date of the enactment of this Act, the Comptroller General of the United States shall conduct a study to determine whether the States have substantially complied with the amendments made by this section, including specifically whether the States have— (A) established successful procedures that screen all foster children under the responsibility of the States for their potential eligibility for benefits under title II of the Social Security Act and for supplemental security income benefits under title XVI of such Act; (B) provided all such potentially eligible foster children assistance in applying for, and appealing decisions made with respect to, the benefits