Virginia Code § 38.2-1820 requires licensees (agents, agencies, or other entities) operating under an assumed or fictitious name to register that name with the Bureau of Insurance. This ensures transparency and consumer protection by linking all business names to the licensed entity. The statute specifies notification either at the time of license application or within 30 calendar days after adopting the assumed name, making option A correct. This timeline allows the Bureau to update records promptly without undue delay. Option B (60 days from first policy sale) introduces an unrelated trigger—policy sales—and extends the period beyond Virginia’s requirement, making it incorrect. Option C (license renewal) delays notification unnecessarily, as renewals occur biennially (Virginia Code § 38.2-1822), conflicting with the need for timely registration. Option D (30 days before discontinuing the name) is illogical; notification is required when adopting, not abandoning, a name. The study guide likely stresses this 30-day rule to ensure compliance with Virginia’s licensing oversight, reinforcing A as the precise answer based on regulatory intent and practice.