reflecting the priorities identified in section 222. The assessment shall identify opportunities for operational efficiencies that could result in cost savings and increased research productivity. (c) Transmittal The Administrator shall transmit the results of the independent cost estimate to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate not later than 6 months after the date of enactment of this Act. (d) Study Not later than 120 days after the date of enactment of this Act, the Administrator shall submit to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate, the results of an assessment of— (1) technological challenges to operating the ISS until 2028