; (ii) a loan purchased under section 459A; or (iii) a loan that has been assigned to the Secretary under section 428(c)(8) or part E. (B) Noncovered loan The term noncovered loan means a loan made, insured, or guaranteed under this title that is not a covered loan. (11) Application of prepayment amounts (A) Requirement Notwithstanding any other provision of this subsection or any other provision of law— (i) with respect to loans made to an eligible borrower under this part or part B, which are held by the same holder and which have different applicable rates of interest, the holder of such loans shall, unless otherwise requested by the borrower in writing, apply the borrower’s prepayment amount (within the meaning of section 682.209(b) of title 34, Code of Federal Regulations, or a successor regulation) for one or more of such loans, first toward the outstanding balance of principal due on the loan with the highest applicable rate of interest among such loans