Which of these brand slogans holds a Guinness World Record for being the longest continuously used slogan in advertising history?

The Guinness World Records has documented many remarkable achievements in marketing and branding over the years. This trivia tests your knowledge about brand slogans that have made their mark in history books. Some taglines have achieved incredible longevity, recognition, or impact that earned them a place in marketing history. Can you identify which slogan broke records for its effectiveness or longevity?

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De Beers: "A Diamond is Forever" (since 1948)
Nike: "Just Do It" (since 1988)
Maxwell House: "Good to the Last Drop" (since 1915)
Coca-Cola: "It's the Real Thing" (since 1969)