428H or a Federal Direct Unsubsidized Stafford Loan that was made to an undergraduate student, the rate of interest on such refinanced Federal Direct Unsubsidized Stafford Loan shall be equal to the rate of interest for a Federal Direct Unsubsidized Stafford loan made to an undergraduate student for which the first disbursement is made on the date on which the refinanced Federal Direct Unsubsidized Stafford Loan is made under this section. (ii) Rates for graduate and professional FDUSL In the case of a refinanced Federal Direct Unsubsidized Stafford loan for which the original loan was a loan under section 428H or a Federal Direct Unsubsidized Stafford Loan that was made to an graduate student, the rate of interest on such refinanced Federal Direct Unsubsidized Stafford Loan shall be equal to the rate of interest for a Federal Direct Unsubsidized Stafford loan made to a graduate student for which the first disbursement is made on the date on which the refinanced Federal Direct Unsubsidized Stafford Loan is made under this section. (C) Federal Direct PLUS loans In the case of a refinanced Federal Direct PLUS Loan for which the original loan was a loan under section 428B or a Federal Direct PLUS Loan, the rate of interest on such refinanced Federal Direct PLUS loan shall be equal to the rate of interest for a Federal Direct PLUS loan for which the first disbursement is made on the date on which the refinanced Federal Direct PLUS loan is made under this section. (D) Consolidation loans In the case of a refinanced Federal Direct Consolidation Loan for which the original loan was a loan under section 428C or a Federal Direct Consolidation Loan, the rate of interest of such refinanced Federal Direct Consolidation Loan shall be equal to the lower of a rate calculated in accordance with paragraph (2). (2) Interest Rates for Consolidation Loans (A) Method of calculation In order to determine the interest rate for any refinanced Federal Direct Consolidation Loan under paragraph (1)(D), the Secretary shall— (i) determine