Which scientific technology is primarily used in modern 'smart shelves' to detect when products are removed and need restocking?

In recent years, science and technology have dramatically transformed retail environments. One of the most significant innovations has been the development of smart shelf technology, which combines sensors, AI, and data analytics to revolutionize inventory management and customer experience. This poll tests your knowledge about how scientific advancements are being applied in modern retail environments to collect crucial data for optimization and customer insights.

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RFID (Radio-Frequency Identification) sensors
Quantum dot sensors
Spectrophotometric analyzers
Piezoelectric pressure plates