Which of the following technologies is NOT typically integrated into smart shelf systems used in modern grocery stores?

Smart shelves are transforming how food retailers track inventory, display pricing, and interact with customers. These IoT-enabled systems use weight sensors, RFID technology, and digital displays to create a more efficient shopping experience while gathering valuable consumer behavior data. Test your knowledge about this innovative retail analytics technology that's changing the grocery shopping experience.

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Computer vision cameras that track when items are removed from shelves
RFID sensors that automatically detect inventory levels
Blockchain verification that confirms product authenticity at the shelf
Digital price tags that can be updated remotely in real-time