Which statement most accurately describes a defining feature of prime vendors?

• A. Civilian companies that accept the International Merchant Purchase Authorization Card (IMPAC)
• B. Civilian companies that use the 13-digit national stock number (NSN)
• C. Civilian companies contracted by Defense Logistics Agency (DLA) that usually deliver supplies within 24 hours
• D. Civilian companies with which the government has a blanket purchase agreement

Answer: (C)

Prime vendors are civilian firms that the Defense Logistics Agency contracts to supply a broad range of items, with a focus on rapid delivery to meet mission needs. The defining feature is this direct contractual role with the DLA and the expectation of quick fulfillment—usually within 24 hours. The other ideas describe related procurement tools or item identification (IMPAC as a payment method, NSN as an item number) or a contractual arrangement (a blanket purchase agreement) that can apply in various contexts but do not define the prime vendor concept itself.