The principal asked his broker to assist him with making tax and title decisions in several real estate transactions. In order to compensate the broker fairly, the client itemizes the payments to the broker, listing sales commission separately from advisory work on these legal matters. This is: A) allowed as long as the legal advice is limited to matters of real estate law B) illegitimate way to compensate the broker for his expertise C) permitted only if the legal advice is billed as a percentage D) an unauthorized practice of law