Which product holds the Guinness World Record for the 'fastest-selling consumer electronics device' in history?

The Guinness World Records has documented many impressive achievements in retail and product development. Some brands have broken records for product launches, sales figures, and marketing campaigns that captured global attention. This trivia tests your knowledge about famous products that have earned their place in the record books. Do you know which product holds this particular distinction?

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Apple iPhone 6/6 Plus (selling 10 million units in the first weekend)
Sony PlayStation 4 (selling 7 million units in the first month)
Samsung Galaxy S4 (selling 20 million units in the first two months)
Nintendo Switch (selling 5 million units in the first four weeks)