Final answer:
Yes, it is mandatory for a responsible broker to notify the commission if the licensee under them has violated license law.
Step-by-step explanation:
Yes, it is mandatory for a responsible broker to notify the commission if the licensee under them has violated license law. Responsible brokers have a duty to ensure that their licensees maintain compliance with license laws and regulations. Failure to report violations can result in disciplinary action against the broker and could jeopardize their own license. For example, in the securities industry, the Securities and Exchange Commission (SEC) expects brokers to report any violations committed by their registered representatives.