Which e-reader product launch included a groundbreaking 'Whispersync' technology that synchronized a reader's progress across multiple devices, revolutionizing how books were sold and consumed?

The publishing industry underwent a massive transformation with the advent of e-readers, forever changing how we purchase, store, and consume literature. These digital devices disrupted traditional bookstore models and created entirely new retail ecosystems for authors and publishers. This trivia question explores a pivotal moment in literary retail innovation that reshaped an entire industry's sales strategy and consumer experience.

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Amazon Kindle (2007)
Barnes & Noble Nook (2009)
Sony Reader (2006)
Apple iBooks for iPad (2010)