Which innovative product launch strategy did publisher Scholastic use for the final Harry Potter book that changed how major literary releases are marketed?

The publishing industry has evolved dramatically in how books are marketed and launched to reach readers. Behind every bestseller is a carefully crafted product launch strategy that can make the difference between obscurity and literary fame. This trivia question explores an innovative product launch technique that revolutionized book marketing in the digital age and created unprecedented buzz for a major literary release.

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Midnight release parties at bookstores with themed events and costumes
Releasing the first three chapters exclusively as NFTs on a blockchain platform
Subscription-based early access where readers paid monthly fees to receive chapters serially
Interactive AR displays in retail stores that revealed plot points when scanned with smartphones