; or (B) the interest rate that is determined by reducing by not less than 1/2 of 1 percent and not more than 1 percent (but to not less than zero percent) the interest rate on the loan to be provided by the DFC to the qualified corporation, whichever is the lesser. (b) No negative effects on employment in the United States The DFC shall not provide assistance under this section unless the Secretary of Commerce has determined that the provision of the assistance would not result in a negative effect on employment in the United States. (c) Disposition of unused assistance A corporation to which financing is made under this section shall remit to the DFC any portion of the assistance that is not expended within a period of time after the date the financing is made that is determined by the DFC on a case-by-case basis. (d) Conditions on provision of loans The DFC— (1) may provide loans under this section to a corporation only if the loans are commercially viable, as determined by the DFC