disqualified benefit

(A) any post-retirement medical benefit or life insurance benefit provided with respect to a key employee if a separate account is required to be established for such employee under section 419A(d) and such payment is not from such account,

(B) any post-retirement medical benefit or life insurance benefit provided with respect to an individual in whose favor discrimination is prohibited unless the plan meets the requirements of section 505(b) with respect to such benefit (whether or not such requirements apply to such plan), and

(C) any portion of a welfare benefit fund reverting to the benefit of the employer.