What information must be verified about a vendor before making a purchase with the GPC?

The correct choice encompasses essential aspects of vendor verification that are crucial before using the Government Purchase Card (GPC). Verifying the vendor's legitimacy ensures that the organization is engaging with a legitimate entity, thereby reducing the risk of fraud and ensuring compliance with government regulations. Checking pricing is vital to ensure that the costs align with market standards and that the purchase remains within budget constraints. Confirming the vendor's ability to deliver the required goods or services is also critical; it ensures that the vendor can meet the contractual obligations and provide what is needed in a timely manner, which directly impacts mission performance.

This comprehensive approach to vendor verification highlights the importance of due diligence in the procurement process, underlining the need for ensuring that all aspects of a purchase are properly vetted to avoid potential issues down the line. Other options, while they cover certain aspects of vendor assessment, do not provide a complete picture required for making informed purchasing decisions with the GPC.