Which classic literary work became the first million-selling e-book exclusively released through Amazon's Kindle platform before any print edition was available?

The publishing industry has undergone massive transformation with the rise of e-commerce platforms. Major online retailers have revolutionized how readers discover, purchase, and consume literature. This trivia question explores a significant milestone in the intersection of literature and e-commerce that changed the publishing landscape forever.

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Stephen King's 'Riding the Bullet' (2000)
J.K. Rowling's 'The Tales of Beedle the Bard' (2008)
Margaret Atwood's 'The Heart Goes Last' (2015)
George R.R. Martin's 'A Dance with Dragons' (2011)