; and (C) if— (i) the income from such loan is excluded from gross income for purposes of chapter 1 of the Internal Revenue Code of 1986; or (ii) the guarantee provides significant collateral or security, as determined by the Administrator, for other obligations the income from which is so excluded. (3) Guarantees A loan guarantee provided under this section shall be conclusive evidence that— (A) the guarantee has been properly obtained; (B) the underlying loan qualified for such guarantee