1. Each Member State shall ensure that all statutory auditors and audit firms are subject to a system of quality assurance which meets at least the following criteria:
(a) the quality assurance system shall be organised in such a manner that it is independent of the reviewed statutory auditors and audit firms and is subject to public oversight;
(b) the funding for the quality assurance system shall be secure and free from any possible undue influence by statutory auditors or audit firms;
(c) the quality assurance system shall have adequate resources;
(d) the persons who carry out quality assurance reviews shall have appropriate professional education and relevant experience in statutory audit and financial reporting and, where applicable, in sustainability reporting and in the assurance of sustainability reporting or in other sustainability-related services, combined with specific training on quality assurance reviews;
(e) the selection of reviewers for specific quality assurance revie
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