Which book holds the record for the most expensive product launch campaign in publishing history, with marketing costs exceeding $20 million?

Product launches in the publishing world have evolved dramatically over time. While most books receive modest marketing budgets, some publishers have invested astronomical sums to launch potential blockbusters. This poll tests your knowledge of memorable book product launches that changed the publishing industry and set new standards for how literary works are brought to market. Can you identify which book received the most expensive marketing campaign in publishing history?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

J.K. Rowling's 'Harry Potter and the Deathly Hallows' (2007)
Dan Brown's 'The Lost Symbol' (2009)
George R.R. Martin's 'A Dance with Dragons' (2011)
E.L. James's 'Fifty Shades of Grey' (2011)