Which product holds the Guinness World Record for the largest first-day sales in retail history, selling over 8 million units in 24 hours?

World records aren't just about human feats - they also exist in the retail world! The consumer products industry has seen some truly remarkable product launches that have shattered sales records and made history. This trivia question tests your knowledge about one of the most impressive product launches ever recorded in terms of first-day sales. Do you know which brand and product holds this impressive world record?

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Apple iPhone 6/6 Plus (2014)
Call of Duty: Black Ops (2010)
Harry Potter and the Deathly Hallows book (2007)
PlayStation 4 console (2013)