Which e-commerce innovation led to the most significant growth in independent author sales in the 2010s?

The publishing industry has undergone dramatic transformation with the rise of digital platforms and e-commerce solutions. These changes have affected how books are marketed, sold, and consumed by readers worldwide. This trivia question explores a significant innovation in the literary e-commerce landscape that revolutionized book retail and reader engagement. Test your knowledge of how technology has reshaped the business of literature!

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Amazon's Kindle Direct Publishing (KDP) self-publishing platform
Barnes & Noble's NOOK Press author program
Apple's iBooks Author publishing software
Kobo Writing Life self-publishing platform