Which source of supply provides wholesale support to government agencies?

The correct source of supply that provides wholesale support to government agencies is the General Services Administration (GSA). The GSA plays a crucial role in offering products and services to government entities while ensuring efficiency and cost-effectiveness. It manages a wide range of services, including procurement of goods and services, and operates a centralized purchasing system to fulfill the needs of various federal agencies.

The agency's procurement system allows government agencies to purchase supplies at competitive prices, leveraging its purchasing power. This process not only streamlines acquisition efforts for government organizations but also adheres to federal regulations designed to ensure fairness and transparency in government contracting.

While each of the other options has its unique responsibilities within supply chain management or logistics, they do not primarily focus on providing wholesale support to federal agencies in the same breadth as the GSA does. The Defense Logistics Agency is known for logistics support for the Department of Defense, while the Supply Chain Management Agency and the National Logistics Center may focus on specific missions or functions rather than acting as a wholesale supplier for government agencies broadly.