Which of these food retail technology innovations has been credited with reducing grocery checkout times by up to 400% in stores where it's fully implemented?

The grocery and food retail landscape is constantly evolving with new technologies changing how consumers shop and how stores operate. From inventory management to customer experience innovations, today's food retailers are embracing digital transformation. This trivia question explores one of the most significant technological advancements changing the food shopping experience in recent years.

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RFID-enabled smart shelves that automatically track inventory
Computer vision and AI-powered cashierless checkout systems
Blockchain-based food traceability platforms
Mobile scan-and-go apps with integrated loyalty programs