Which innovative retail inventory management system was first developed for military PX stores during WWII that later became standard practice in civilian retail?

The Post Exchange (PX) system revolutionized retail operations within military installations worldwide. Established to provide essential goods and morale-boosting items to service members, the PX became a crucial component of military logistics and welfare. This poll tests your knowledge about the innovative retail practices developed within military supply chains that later influenced civilian retail operations.

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Just-in-time (JIT) inventory management
First-in, first-out (FIFO) accounting method
Economic Order Quantity (EOQ) model
ABC inventory classification system