(4) SANCTIONS.—If the Board finds, based on all of the facts and circumstances, that a registered public accounting firm or associated person thereof has engaged in any act or practice, or omitted to act, in violation of this Act, the rules of the Board, the provisions of the securities laws relating to the preparation and issuance of audit reports and the obligations and liabilities of accountants with respect thereto, including the rules of the Commission issued under this Act, or professional standards, the Board may impose such disciplinary or remedial sanctions as it determines appropriate, subject to applicable limitations under paragraph (5), including