Which retail analytics innovation had the biggest impact on Black Friday shopping strategies between 2015-2020?

Black Friday has transformed from a single-day shopping event to a global retail phenomenon. While originally associated with post-Thanksgiving sales in the United States, it has evolved significantly in terms of timing, global reach, and consumer engagement strategies. This trivia question tests your knowledge about how retail analytics have shaped modern Black Friday campaigns and consumer behavior patterns during this shopping festival.

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Real-time inventory management systems that allowed retailers to shift stock between online and physical stores during peak demand periods
Facial recognition technology in stores to identify repeat Black Friday shoppers
Voice analysis software measuring customer frustration levels at checkout lines
Drone-based tracking of parking lot occupancy rates to predict in-store traffic