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

Brand slogans can make or break a company's identity in the market. Some have been so successful they've set world records for longevity, recognition, or impact. This trivia question challenges your knowledge about a particular slogan that earned its place in the Guinness World Records. Do you know which iconic tagline has achieved this remarkable distinction?

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