In which decade was the concept of 'brand positioning' first formally introduced to the marketing world by Al Ries and Jack Trout?

In the annals of marketing history, certain concepts revolutionized how companies presented their products to consumers. Brand positioning emerged as one of the most influential frameworks that transformed advertising and product development. This trivia question explores the historical origins of this fundamental marketing concept that continues to shape business strategies worldwide.

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1950s, during the post-war advertising boom
1960s, alongside the creative revolution in advertising
1970s, in a series of articles for 'Advertising Age' magazine
1980s, with their bestselling book on competitive marketing