Which e-commerce platform first introduced the self-publishing program that allowed authors to directly publish and sell e-books without traditional publisher approval, revolutionizing the literary industry?

The publishing industry has undergone massive transformation in the digital age. From traditional bookstores to online giants, the way readers discover and purchase books has evolved dramatically. This poll tests your knowledge about the e-commerce platforms that have reshaped the literary marketplace and how they've influenced author careers, reader habits, and publishing strategies. Can you identify the key milestones in the digital revolution of book retail?

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Amazon Kindle Direct Publishing (KDP)
Barnes & Noble Press (formerly NOOK Press)
Apple Books (formerly iBooks Author)
Kobo Writing Life