If the third party is unable to identify which contributions were received during the period referred to in paragraph (4)(a) for partisan activity, partisan advertising, election advertising or election survey purposes, the third-party expenses return shall include the names and addresses of every contributor who contributed a total of more than $200 to it during that period.
If the third party is unable to identify which contributions were received during the period referred to in paragraph (4)(a) for partisan activity, partisan advertising, election advertising or election survey purposes, the third-party expenses return shall include, subject to paragraph (4)(b.1), the names and addresses of every contributor who contributed a total of more than $200 to it during that period.
If the third party is unable to identify which contributions were received for election advertising purposes in the period referred to in paragraph (4)(a), it must list, subject to paragraph (4)(b.1), the names and addresses of every contributor who donated a total of more than $200 to it during that period.