Which feature was first introduced in commercial smart refrigerators that directly impacted online grocery shopping?

The food retail landscape is rapidly evolving with IoT technology transforming kitchen appliances. Smart refrigerators now offer features that were unimaginable just a decade ago, changing how consumers shop for groceries and manage food inventory. These innovations are reshaping the relationship between food retailers, manufacturers, and consumers - creating new opportunities for engagement and data collection. Test your knowledge about this cutting-edge retail technology trend!

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Internal cameras that allow viewing contents remotely via smartphone apps
Voice assistant integration for hands-free operation
Automatic inventory tracking with RFID scanning of products
Door-in-door design for energy efficiency