In the U.

TheVendor Master Filetopic in the APS Certification Program covers vendor validation to ensure legitimacy and prevent fraud. The best way to verify a vendor’s business registration in the U.S. is tocheck the database of the Secretary of Statein the state where the vendor is registered, as this provides authoritative, public confirmation of the vendor’s legal status and registration details.

Option A (Send a letter to the vendor requesting written confirmation): Incorrect. Vendor-provided confirmation is less reliable, as it may be falsified, and is not authoritative.

Option B (Submit a request to the IRS to do a Form 1120 search): Incorrect. Form 1120 is a corporate tax return, not a business registration record, and the IRS does not provide registration verification services.

Option C (Require a sworn affidavit from the vendor’s financial institution): Incorrect. Financial institutions do not typically provide affidavits for business registration, and this is not a standard practice.

Option D (Check the database of the Secretary of State where the vendor is registered): Correct. Secretary of State databases offer verifiable, public records of business registration, the most reliable method.

Reference to IOFM APS Documents: The APS e-textbook underVendor Master Filestates, “To verify a vendor’s business registration, check the Secretary of State database in the vendor’s state of incorporation for authoritative confirmation.” The training video notes, “The best practice for validating vendor legitimacy is accessing Secretary of State records online to confirm registration details.”