A 1988 last signatory operator or last signatory operator described in paragraph (3), and any related person to any such operator, shall be jointly and severally liable with such operator for any amount required to be paid by such operator under this section. The provisions of section
shall apply to any last signatory operator described in such section (without regard to whether security is provided under such section, a payment is made under section
, or both) and if security meeting the requirements of section
is provided, the common parent described in section
shall be exclusively responsible for any liability for premiums under this section which, but for this sentence, would be required to be paid by the last signatory operator or any related person.