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

Brand slogans are powerful tools in marketing, but some have achieved remarkable longevity that sets them apart in advertising history. The most enduring slogans become part of popular culture and can significantly boost brand recognition for decades. This trivia question tests your knowledge about which famous company holds the world record for the longest continuously used advertising slogan without significant modification.

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De Beers with "A Diamond is Forever" (1948-present)
Maxwell House with "Good to the Last Drop" (1915-present)
Coca-Cola with "Delicious and Refreshing" (1886-present)
Avis with "We Try Harder" (1962-present)