Which of these famous brand slogans was introduced first historically?

Brand slogans have shaped consumer culture and reflected historical moments throughout the 20th and 21st centuries. Some taglines have remained unchanged for decades, becoming as iconic as the products themselves, while others evolved with changing times and social attitudes. Test your knowledge of how famous companies communicated their brand promises throughout history!

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De Beers: "A Diamond is Forever" (1948)
Nike: "Just Do It" (1988)
Coca-Cola: "It's the Real Thing" (1969)
McDonald's: "I'm Lovin' It" (2003)