to the Secretary a lien on assets necessary to achieve not more than 100 percent collateralization of the loan value. (B) Best lien Except as provided in section 764.106 of title 7, Code of Federal Regulations (or successor regulations), the Secretary shall take the best lien obtainable on assets described in subparagraph (A), subject to the condition that a primary residence shall be the last option available to the Secretary to achieve 100 percent collateralization of the loan value. (4) Prohibition on additional security The Secretary may not secure a direct farm loan with any property that provides security in excess of the amount of security value equal to the loan amount. (d) Eligibility requirements The Secretary shall not impose any limitation relating to the number of years in which a farm loan may be closed by a borrower. . (b) Refinancing of debt with farm loans (1) Purposes of farm ownership loans Section 303(a)(1) of the Consolidated Farm and Rural Development Act ( 7 U.S.C. 1923(a)(1) ) is amended by striking subparagraph (E) and inserting the following: (E) refinancing indebtedness. . (2) Purposes of operating loans Section 312(a) of the Consolidated Farm and Rural Development Act ( 7 U.S.C. 1942(a) ) is amended by striking paragraph (9) and inserting the following: (9) refinancing the indebtedness of a borrower