Which of these famous product taglines holds the Guinness World Record for 'longest continuously used slogan in advertising'?

The Guinness World Records catalog includes many fascinating retail and advertising milestones. Behind some of the world's most successful products are taglines that have broken records for longevity, recognition, or cultural impact. This poll tests your knowledge about famous product taglines that have made their mark in the record books. Can you identify which slogan has achieved a remarkable world record status?

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