Which groundbreaking marketing strategy helped transform the Harry Potter series from a children's book into a global phenomenon?

The publishing industry has seen various innovative marketing strategies over the decades, but few have matched the cultural impact and commercial success of certain literary franchises. This poll tests your knowledge about one of the most successful book marketing campaigns in publishing history - the Harry Potter series by J.K. Rowling, which revolutionized how books are marketed to audiences worldwide.

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Simultaneous 'midnight release parties' at bookstores worldwide, creating cultural events around book launches
Publishing different cover designs for adult and children markets, allowing broader audience appeal without stigma
The innovative 'read one, get one free' campaign that bundled books together to encourage series completion
The subscription model where readers pre-paid for the entire series and received each book automatically upon release