Who is responsible for enforcing compliance with the rules set by FINRA?

The role of enforcing compliance with the rules set by the Financial Industry Regulatory Authority (FINRA) is specifically designated to FINRA itself. This organization is a self-regulatory body that oversees brokerage firms and exchange markets in the United States, ensuring that its member organizations adhere to established standards and rules.

FINRA's authority includes the ability to investigate potential violations, impose penalties for misconduct, and sanction firms or individuals that do not comply with regulatory rules. This is crucial for maintaining market integrity and protecting investors.

Other entities, such as the Securities and Exchange Commission, play a broader regulatory role in the securities industry but are not directly responsible for enforcing FINRA's specific rules. While internal auditors and the Department of Justice may have important functions related to financial compliance and law enforcement, they do not directly enforce FINRA's regulations. Thus, FINRA's direct responsibility and established framework for compliance makes it the correct answer.