; (ii) the implementation of a solution to remedy the violation or suspected violation; and (iii) a method to check the effectiveness of such solution. (b) Additional requirements relating to audits (1) No retaliation for audit cooperation Any covered business entity, supplier of a covered business entity, or on-site service provider of a covered business entity shall not retaliate against any worker for participating in an interview under paragraph (1) or (2) of subsection (a) or providing to an auditor information necessary for the audit requirements under subsection (a)(3). (2) Contract requirements Each covered business entity shall include, in any contract with a supplier or on-site service provider, a requirement that— (A) the supplier or on-site service provider shall not retaliate against any worker for participating in an audit relating to unlawful child labor