Which innovative product design is credited with making literature significantly more accessible to the masses in the early 2000s?

The publishing industry has created some iconic product designs that have shaped how we experience literature. From distinctive book covers to innovative reading formats, product design in literature has evolved dramatically over the centuries. This poll tests your knowledge of influential design decisions that transformed how readers interact with literary works. Can you identify the groundbreaking product design that revolutionized the publishing industry?

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Amazon Kindle (2007), which normalized digital reading with its e-ink display and wireless book delivery
Penguin's tri-band color-coded covers (1935), which made quality literature affordable through standardized designs
Library of America's uniform hardcover editions (1979), which elevated American classics through consistent design language
Audible's subscription model (1995), which pioneered the concept of monthly audiobook credits