Which of the Following Is Acceptable Under the AICPA Rules

Which of the following is acceptable under the AICPA Rules of Conduct?

A) Using the name of a past owner in the firm name of a successor organization.
B) Receive a commission from one client for recommending the products or services of another client.
C) A firm may advertise itself as "Members of the American Institute of Certified Public Accountants", as long as at least one of its CPA owners is a member.
D) Perform any professional services for a contingent fee for a client for whom the member performs an audit or review of the financial statements.