What action is enabled by scanning a UPC code at the register?

Scanning a UPC code at the register enables instantaneous pricing and inventory management. When the barcode is scanned, it triggers the point-of-sale system to retrieve the specific price of that item from the store's database. This not only ensures that the correct amount is charged to the customer but also updates the inventory levels in real-time, reflecting the sale immediately.

This process helps prevent discrepancies in stock levels and ensures efficient inventory control, allowing stores to manage their stock more effectively based on the real-time data collected from sales. While other options involve valuable functionalities of retail technology, they are not the direct actions facilitated by UPC scanning at the register. For instance, checking product availability in store may rely on a separate inventory system, tracking customer purchase history involves different mechanisms in customer relationship management, and providing detailed product information typically requires additional systems beyond the point of sale.