Final answer:
FINRA firms are obligated by regulation to have at least two principals who oversee the firm's compliance with industry standards.
Step-by-step explanation:
FINRA firms are required to employ a certain number of principals to oversee their operations and ensure compliance with industry regulations. According to FINRA rules, these firms must have at least two principals. These principals are responsible for supervising the firm's activities and its associated persons, ensuring adherence to financial responsibility rules and compliance standards.