Which emerging technology has revolutionized retail customer analytics by enabling real-time analysis of in-store customer movement patterns without violating privacy concerns?

In today's data-driven retail landscape, scientific approaches to customer analytics have transformed how businesses understand consumer behavior. Advanced algorithms and machine learning techniques now allow retailers to predict purchasing patterns with unprecedented accuracy. How well do you understand the cutting-edge technologies reshaping retail customer analytics in the scientific sector?

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Thermal imaging sensors that track anonymous heat signatures to create movement flow maps
Facial recognition systems that identify individual customers and match them to their online profiles
RFID chips embedded in shopping carts that require customer login before use
Mandatory smartphone apps that customers must install to enter stores