Which brand slogan holds the Guinness World Record for the longest continuously used advertising slogan in history?

Brand slogans can make or break a product's identity in the marketplace. Some have been so successful they've set world records for longevity, recognition, or cultural impact. Test your knowledge of these iconic marketing phrases that have earned their place in advertising history and the Guinness World Records.

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De Beers - 'A Diamond is Forever' (since 1948)
Coca-Cola - 'It's the Real Thing' (since 1942)
Maxwell House - 'Good to the Last Drop' (since 1959)
Nike - 'Just Do It' (since 1988)