; (ii) leave the repayment plan described in subparagraph (A) and enter a standard 10-year repayment plan under section 455(d)(A)(A); or (iii) not more than once per calendar year, switch between the repayment plans described in clauses (i) and (ii); (C) after electing to leave a repayment plan other than an income-based repayment plan described under this subsection or a standard 10-year repayment plan under section 455(d)(A)(A), shall not be permitted to re-elect a repayment plan that is not an income-based repayment plan under this subsection or such standard 10-year repayment plan; and (D) shall retain, for purposes of repayment or cancellation of any outstanding balance of principal and interest due on a loan (as described in subsection (b)(7)) any years of repayment under another income-based or income-contingent repayment plan under this title. (4) Cap on interest accrual Notwithstanding any other provision of this Act, the total amount of interest that accrues during a borrower's grace period and the time that a borrower is in repayment under this subsection shall not exceed 50 percent of the original principal amount of the loan. . 402. Termination of certain repayment plan options (a) Effective date