A Musician Believed That His Record Company Was Not Paying

A musician believed that his record company was not paying him the agreed-upon royalty on all songs downloaded by fans from a well-known music Internet site.This musician hired a CPA to perform a royalty audit of the record company's sales revenues.The musician and the CPA agreed that that the CPA will be entitled to receive 5% of all amounts recovered by the musician as a result of this royalty audit.They also agreed to keep the results private.This arrangement is:

A) Ethical
B) Unethical under all circumstances
C) Unethical if the amounts recovered exceed fair compensation for the CPA's time and effort
D) Unethical, unless a court or other administrative body, such as the American Federation of Musicians, approves of this fee arrangement