Which innovative product design feature did Barnes & Noble introduce in 2019 to transform their stores into 'experiential' retail destinations?

In the evolving world of literary retail, bookstores have had to innovate their business models and physical spaces to remain relevant in the digital age. This trivia question explores how one major bookstore chain transformed its product design and customer experience strategy to compete with online retailers. Test your knowledge about the intersection of literary retail and modern product design!

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Full-service restaurants with literary-themed menus
Virtual reality stations where customers could 'meet' famous authors
Subscription-based private reading rooms with premium amenities
In-store book printing machines for on-demand publishing