; and (B) such additional amounts, not to exceed 2 percent of the amounts under subparagraph (A), as are determined necessary by the Office of Personnel Management to pay the cost of administering retirement benefits for employees who retire from the Corporation after the date of transfer under either CSRS or FERS, for their survivors, and for survivors of employees of the Corporation who die after the date of transfer (which amounts shall be available to the Office of Personnel Management as provided in section 8348(a)(1)(B) of title 5). (3) Thrift Savings Fund The Corporation shall pay to the Thrift Savings Fund such employee and agency contributions as are required by section 8432 of title 5 for employees who elect to retain their coverage under FERS pursuant to paragraph (1). (4) Health benefits plan election Any employee of the Corporation who was subject to the Federal Employees Health Benefits Program under chapter 89 of title 5 (in this section referred to as FEHBP ) on the day immediately preceding the date of transfer shall have the option to receive health benefits from a health benefit plan established by the Corporation under section 90316(c) or to continue coverage under FEHBP without interruption. (5) Payments to Employees Health Benefits Fund For employees of the Corporation who elect to retain their coverage under FEHBP pursuant to paragraph (4), the Corporation shall pay to the Employees Health Benefits Fund— (A) such employee deductions and agency contributions as are required by subsections (a) through (f) of section 8906 of title 5