Which revolutionary retail innovation did Nike first introduce in 2012 that transformed how athletic performance shoes are designed and sold?

The athletic footwear market is a battleground of innovation where brands constantly push technological boundaries to give athletes the competitive edge. In recent years, we've seen revolutionary advances in materials, sustainability practices, and performance-enhancing features. This poll tests your knowledge about a significant retail innovation that transformed how performance athletic shoes are marketed and sold to consumers. Can you identify which groundbreaking approach changed the athletic footwear landscape?

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Flyknit technology, allowing for digitally engineered knitted uppers that reduced waste by 60% compared to traditional cut-and-sew methods
The 3D foot scanning system that creates custom-molded insoles in-store within 30 minutes
The subscription-based athletic footwear model where customers receive new performance shoes every 3 months
Biodegradable midsole technology that decomposes within 3 years after disposal