Choice "D" is correct. Information contained in client files ("workpapers") are the property of the CPA firm. Although the accounting firm owns the workpapers, the firm and its employees are generally prohibited from showing the workpapers to anyone without the client's permission. Furthermore, an employee of a CPA firm may not take information contained in client files when leaving the firm. Workpapers produced by the firm for, or on behalf of a client, may not be copied and removed by an employee for personal use.