Which groundbreaking marketing strategy did Nike implement in 1984 that transformed sports endorsement deals and created a billion-dollar product line?

In the competitive world of sports apparel and equipment, marketing can define a brand's success. Nike has consistently been at the forefront of innovative sports marketing strategies, creating campaigns that resonate with athletes and fans alike. This trivia question focuses on one of Nike's most significant marketing decisions that revolutionized how sports brands approach athlete endorsements and changed sports marketing forever.

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Creating the Air Jordan line with rookie Michael Jordan, establishing the first signature athlete shoe that transcended performance to become a cultural phenomenon
Launching the 'Just Do It' slogan alongside a comprehensive Olympic advertising campaign featuring multiple gold medalists
Developing the Nike+ platform that connected shoes to digital devices, creating the first major sports equipment and technology integration
Introducing the 'Nike By You' (originally NikeID) customization service, pioneering mass personalization in sports retail