Which technology is NOT used in Amazon Go stores to enable their checkout-free shopping experience?

Amazon Go stores pioneered a new retail experience using advanced technology to eliminate checkout lines. This innovation has geographical implications for how physical retail spaces are designed and distributed across urban landscapes. Test your knowledge about this groundbreaking retail concept that's reshaping the geographic footprint of convenience stores in metropolitan areas.

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RFID tags on every product
Computer vision systems
Weight sensors on shelves
Deep learning algorithms