Final answer:
Financial industry regulations typically require firms to keep records of customer complaints for at least four years at the office of Supervisory Jurisdiction.
Step-by-step explanation:
The question pertains to the rules or requirements for the retention of complaints within a business context, more specifically within the financial industry. According to various regulatory guidelines, including those enforced by the Financial Industry Regulatory Authority (FINRA), firms are generally required to retain records of customer complaints for a minimum of four years. It's important for these records to be accessible at the office of Supervisory Jurisdiction or an easily accessible place since they might be needed for reference in regulatory inquiries or customer dispute resolutions.