Which brand slogan holds the Guinness World Record for 'longest-running advertising slogan' having been in continuous use since 1948?

Brand slogans are powerful marketing tools that can define a company's identity for decades. But did you know some slogans have set world records? Test your knowledge about these remarkable marketing achievements that made it into the record books. Can you identify which slogan broke barriers and earned its place in marketing history?

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• De Beers' 'A Diamond is Forever'
• Nike's 'Just Do It'
• McDonald's 'I'm Lovin' It'
• Coca-Cola's 'Open Happiness'

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