(2) (A) In determining the extent to which a plan provides for the distribution of plan assets to the employer for purposes of paragraph (1)(C), any such provision, and any amendment increasing the amount which may be distributed to the employer, shall not be treated as effective before the end of the fifth calendar year following the date of the adoption of such provision or amendment. (B) A distribution to the employer from a plan shall not be treated as failing to satisfy the requirements of this paragraph if the plan has been in effect for fewer than 5 years and the plan has provided for such a distribution since the effective date of the plan. (C) Except as otherwise provided in regulations of the Secretary of the Treasury, in any case in which a transaction described in section 1058 of this title occurs, subparagraph (A) shall continue to apply separately with respect to the amount of any assets transferred in such transaction. (D) For purposes of this subsection, the term “employer” includes any member of the controlled group of which the employer is a member. For purposes of the preceding sentence, the term “controlled group” means any group treated as a single employer under subsection (b), (c), (m) or (o) of section 414 of title 26 .