Final answer:
FINRA is the result of the merge of NASD and the regulatory part of NYSE. FINRA is responsible for regulating brokerage firms and ensuring compliance with industry rules and regulations.
Step-by-step explanation:
FINRA is the result of the merge of NASD and the regulatory part of NYSE. The National Association of Securities Dealers (NASD) was a self-regulatory organization for the securities industry, and it merged with the regulatory part of the New York Stock Exchange (NYSE) to form the Financial Industry Regulatory Authority (FINRA). FINRA is responsible for regulating brokerage firms and ensuring compliance with industry rules and regulations.