Which biometric retail innovation was first successfully deployed at scale in physical stores to analyze shopper behavior and improve product placement?

The intersection of science and retail has led to groundbreaking innovations in how consumers interact with products. Biometric technology has transformed the shopping experience by allowing personalized interactions based on physiological data. This poll tests your knowledge of how scientific advancements are reshaping retail experiences through the integration of cutting-edge biometric technologies. How well do you understand the science powering the future of shopping?

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Facial recognition systems that identify returning customers and their shopping preferences
Eye-tracking technology that maps customer gaze patterns across store layouts and product displays
Fingerprint scanners for personalized checkout and product recommendations
Voice recognition systems that respond to customer queries about products in real-time