18. In January 2008, it was discovered that William Borchard, who handled due diligence for clients of PwC interested in mergers and acquisitions, divulged controversial plans to Gregory Raben, an auditor at the firm, and Raben used the information to buy stock ahead of a series of corporate takeovers. The SEC found the tow guilty of insider trading, a violation of the law. Assume none of the clients were audit clients. What are the ethical issues involved in engaging in such transactions? Were any of the AIPCA rules of conduct violated? Explain.