Which innovative point of sale feature did Barnes & Noble first introduce in 2019 that revolutionized the in-store book discovery experience?

Modern bookstores have undergone significant transformations in their point of sale systems to enhance customer experience and compete with online retailers. These technological innovations have changed how readers discover and purchase books in physical stores. Test your knowledge about the evolution of POS systems in the literary retail world!

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Book Table - digital touchscreen tables that let customers browse the entire catalog while physically in store
Literary Lens - augmented reality app that shows reviews when pointing camera at book covers
Author Voice - audio stations where customers could hear authors reading excerpts from their books
Shelf Sense - RFID technology that tracks which books customers browse but don't purchase