(2)establish or adopt, or both, by rule, auditing, quality control, ethics, independence, and other standards relating to the preparation of audit reports for issuers, in accordance with section 103;
(3)conduct inspections of registered public accounting firms, in accordance with section 104 and the rules of the Board;
(4)conduct investigations and disciplinary proceedings con- cerning, and impose appropriate sanctions where justified upon,
registered public accounting firms and associated persons of such firms, in accordance with section 105;
(5) perform such other duties or functions as the Board (or the Commission, by rule or order) determines are necessary or appropriate to promote high professional standards among, and improve the quality of audit services offered by, registered public accounting firms and associated persons thereof, or other- wise to carry out this Act, in order to protect investors, or to further the public interest;