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

World records aren't just about human feats of strength or endurance! In the marketing world, some brand slogans have made history by breaking records of their own. Test your knowledge about these remarkable advertising achievements that earned their place in the record books. Can you identify the slogan that truly changed marketing history?

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De Beers' 'A Diamond is Forever' (since 1948)
Coca-Cola's 'It's the Real Thing' (since 1942)
Maxwell House's 'Good to the Last Drop' (since 1915)
Nike's 'Just Do It' (since 1988)