What are the four things to validate during technical research?

The correct choice highlights the essential elements necessary for validating technical research in a supply chain context, particularly in the USMC.

Validating the National Stock Number (NSN) ensures that the item being researched is accurately identified among millions of items. The Unit of Issue (U/I) indicates how the item is packaged or measured for distribution, which is crucial for understanding how to order and receive supplies properly. Unit Price (U/P) represents the cost of each unit and is vital for budgeting and cost control. Lastly, the Supply Availability Code (SAC) provides information about the item's availability status in the supply system, which is essential for planning and logistics.

These four components collectively inform decision-making regarding procurement, inventory management, and logistical operations within the Marine Corps supply chain. Validating each item ensures that requisitions are accurate, timely, and cost-effective, contributing to overall mission readiness and efficiency.