either a qualified cash or deferred arrangement (as defined in section 401(k) of the Internal Revenue Code of 1986) or a salary reduction agreement (as described in section 403(b) of such Code) shall not require, as a condition of participation in the arrangement or agreement, that an employee complete a period of service with the employer (or employers) maintaining the plan extending beyond the close of the earlier of— (A) the period permitted under subsection (a)(1) (determined without regard to subparagraph (B)(i) thereof) and section 410(a)(1) of such Code (determined without regard to subparagraph (B)(i) thereof)