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

Brand slogans and taglines help companies stand out in crowded markets, but some have remarkable staying power. This trivia explores a fascinating world record in marketing persistence. Can you identify which brand has maintained the same slogan for the longest time in advertising history? Test your knowledge of brand consistency that has earned a place in the record books!

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De Beers - "A Diamond is Forever" (since 1948)
Coca-Cola - "Delicious and Refreshing" (since 1904)
Maxwell House - "Good to the Last Drop" (since 1915)
Avis - "We Try Harder" (since 1962)