Which innovative retail strategy did Barnes & Noble implement in 2009 that represented a major digital transformation for the traditional bookseller?

The publishing industry has undergone significant digital transformation in recent decades. From traditional bookstores to e-commerce giants, from physical books to e-readers and audiobooks, the way literature reaches consumers has evolved dramatically. This poll tests your knowledge about a pivotal moment in literary retail history that changed how millions access books.

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They launched the NOOK e-reader to compete with Amazon's Kindle
They pioneered the 'print-on-demand' kiosks in physical stores
They introduced the first subscription-based audiobook service
They created the first AI-powered book recommendation system