Which of these product innovations has most significantly transformed the marketing of classic literary works to new generations since 2018?

In the ever-evolving world of arts and literature, publishers and booksellers are constantly seeking new ways to engage customers and drive sales. The marketing of books and literary products has transformed dramatically in recent years, with technology playing a crucial role. This trivia question focuses on an innovative product development trend that has significantly impacted how readers interact with literary merchandise.

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Interactive digital bookmarks with augmented reality features that bring book covers to life
Book-themed subscription boxes with curated merchandise tied to specific titles or genres
Edible book covers made from rice paper featuring classic novel designs
Temperature-sensitive book pages that reveal hidden illustrations when warmed by touch