Which biometric tracking technology has been proven most effective for analyzing customer engagement with natural product displays without requiring customer opt-in?

The natural products industry is embracing technology to understand consumer behavior and preferences. One fascinating development is the implementation of biometric tracking systems in retail environments to analyze how customers interact with natural and organic products. These systems gather valuable data that can transform merchandising strategies and product development. How well do you understand this emerging retail analytics technology in the natural products space?

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Facial recognition systems that map emotional responses to natural product packaging
Anonymous infrared heat mapping that tracks customer dwell time in specific natural product sections
RFID-enabled shopping carts that track the path of customers through natural products aisles
Bluetooth beacons that connect to customers' phones to track interaction with specific natural products