Which children's book series underwent a revolutionary brand transformation in the late 1990s that included a distinctive lightning bolt logo, resulting in over 500 million copies sold worldwide?

The publishing industry has seen remarkable brand evolution strategies that have transformed classic literary works into modern cultural phenomena. Publishers and authors have leveraged innovative storytelling approaches to reimagine traditional literary brands for contemporary audiences. This poll tests your knowledge about one of the most successful literary brand transformations in recent history that revolutionized both book sales and cultural impact.

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Harry Potter series by J.K. Rowling
Percy Jackson series by Rick Riordan
A Series of Unfortunate Events by Lemony Snicket
The Chronicles of Narnia by C.S. Lewis