Which of these famous product taglines holds the Guinness World Record for being the longest continuously used advertising slogan in history?

Some product taglines are so powerful they've set world records for longevity, recognition, or business impact. Behind these iconic phrases are fascinating stories of marketing brilliance. This trivia challenges you to identify which famous slogan holds the Guinness World Record for the longest continuously used advertising slogan in history. Can you separate the merely successful from the record-breaking?

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"A Diamond is Forever" (De Beers)
"Just Do It" (Nike)
"Good to the Last Drop" (Maxwell House)
"Melts in Your Mouth, Not in Your Hands" (M&Ms)