Except as provided in subsection (f)(3), the Secretary, in applying the provisions of this section to benefits or contributions under more than one plan maintained by the same employer, and to any trusts, contracts, accounts, or bonds referred to in subsection (a)(2), with respect to which the participant has the control required under section
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(b) or (c), as modified by subsection (h), shall, under regulations prescribed by the Secretary, disqualify one or more trusts, plans, contracts, accounts, or bonds, or any combination thereof until such benefits or contributions do not exceed the limitations contained in this section. In addition to taking into account such other factors as may be necessary to carry out the purposes of subsection (f), the regulations prescribed under this paragraph shall provide that no plan which has been terminated shall be disqualified until all other trusts, plans, contracts, accounts, or bonds have been disqualified.