; and (B) fully implement the plan submitted under subparagraph (A) by not later than 2 years after receiving the allotment. (2) Return of funds A State that does not wish to receive an allotment under this Act or does not submit a plan described in paragraph (1)(A) by the deadline required under such paragraph shall return the State's allotment to the Secretary of Labor. (3) Use of returned funds The Secretary of Labor shall use any funds returned under paragraph (2) to provide supplemental allotments to the States that did submit a plan under paragraph (1), in the same manner as under subsection (b). (d) Uses of funds (1) Use of funds to improve unemployment compensation administration A State receiving an allotment under this section shall use 50 percent of the amount of such allotment for improving the administration systems of its unemployment compensation law, including by taking such steps as may be necessary to ensure adequate resources in periods of high demand and by modernizing the information technology infrastructure used for such administration. (2) Use of funds to establish experimental portable benefit programs A State receiving an allotment under this section shall use 50 percent of the amount of such allotment for the design, implementation, and evaluation of new models or approaches for providing portable benefits to eligible workers, including— (A) innovative proposals for paid leave; (B) providing a job seeker’s allowance; (C) qualified health plans offered on the Exchanges established under section 1311 or 1321 of the Patient Protection and Affordable Care Act ( 42 U.S.C. 18031 ); (D) retirement-related benefits; (E) the long-term expansion of eligibility for unemployment compensation