Final answer:
Firms must file a FOCUS Report Part II or IIA within a specific timeframe after terminating membership with a regulatory body, but without further context, the exact number of days is not determinable.
Step-by-step explanation:
When a firm terminates its membership with a regulatory body such as FINRA (Financial Industry Regulatory Authority), it is required to file a FOCUS (Financial and Operational Combined Uniform Single) report. Specifically, a FOCUS Report Part II or IIA must be submitted. These reports must be filed within a specific timeframe to remain in compliance with regulatory standards. Unfortunately, without the exact regulatory authority or context, the number of days within which the report must be filed cannot be accurately provided, since requirements may vary by jurisdiction and specific regulatory context.