Which of these sports technology innovations was first to be officially approved for use in professional competition?

In the ever-evolving world of sports, technology has revolutionized how athletes train, compete, and recover. Smart equipment has become a game-changer across various sports, enhancing performance analysis and improving athletic outcomes. This trivia question explores a significant product innovation that transformed one particular sport's landscape. Test your knowledge about cutting-edge sports technology adoption!

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Hawk-Eye line-calling technology in tennis (2006)
Smart footballs with embedded sensors for tracking ball speed and spin (2009)
VAR (Video Assistant Referee) technology in soccer (2016)
Smart swimsuits with hydrodynamic sensors for Olympic swimming (2010)