please give me the correct answers of all

20. When auditors determine that the financial statements of a private firm are presented fairly in accordance with the applicable financial reporting framework, they issue the standard report, which is often referred to as a " " report. A. qualified, clean B. unmodified, clean C. modified, rough D. unqualified, rough 21. A client has changed the salvage values of a number of its fixed assets. The auditors of the public company believe that the revised salvage values are realistic. The appropriate report on the financial statements is: A. Standard unqualified. B. Unqualified with explanatory language as to consistency. C. Qualified for consistency. D. Disclaimer 22. When financial statements are affected by a material departure from generally accepted accounting principles, the auditors should: A. Issue an unmodified opinion with a basis for modification paragraph. B. Withdraw from the engagement. C. Issue an "except for" qualification or an adverse opinion. D. Issue an "except for" qualification or a disclaimer of opinion. 23. What type of audit is concerned with the economy, efficiency and effectiveness of an organization's activities? A. A compliance audit B. An operational audit c. A financial statement audit D. An integrated audit