Final answer:
The FOCUS (Financial and Operational) Combined Uniform Single Report Part I is a compliance document required by the SEC for broker-dealers.
Step-by-step explanation:
The FOCUS (Financial and Operational) Combined Uniform Single Report Part I must be filled out for a Carrying BD. This report is a compliance document required by the Securities and Exchange Commission (SEC) for broker-dealers. It includes financial statements, operational information, and other relevant details about the business.