require— (I) if the election is made before the date the annual certification is submitted to the Secretary or the Secretary’s delegate under section 305(b)(3) of such Act and section 432(b)(3) of such Code, not later than 30 days after the date of the certification, and (II) if the election is made after such date, not later than 30 days after the date of the election. (B) Notice of endangered status Notwithstanding section 305(b)(3)(D) of such Act and section 432(b)(3)(D) of such Code, if the plan is certified to be in critical status for any plan year but is in endangered status by reason of an election made under subsection (a), the notice provided under such sections shall be the notice which would have been provided if the plan had been certified to be in endangered status. 40104. Temporary extension of the funding improvement and rehabilitation periods for multiemployer pension plans in critical and endangered status for 2020 or 2021 (a) In general If the plan sponsor of a multiemployer plan which is in endangered or critical status for a plan year beginning in 2020 or 2021 (determined after application of section 4) elects the application of this section, then, for purposes of section 305 of the Employee Retirement Income Security Act of 1974 and section 432 of the Internal Revenue Code of 1986— (1) except as provided in paragraph (2), the plan’s funding improvement period or rehabilitation period, whichever is applicable, shall be 15 years rather than 10 years, and (2) in the case of a plan in seriously endangered status, the plan’s funding improvement period shall be 20 years rather than 15 years. (b) Definitions and special rules For purposes of this section— (1) Election An election under this section shall be made at such time, and in such manner and form, as (in consultation with the Secretary of Labor) the Secretary of the Treasury or the Secretary’s delegate may prescribe. (2) Definitions Any term which is used in this section which is also used in section 305 of the Employee Retirement Income