Which retail innovation was specifically introduced during Diwali shopping festivals in India around 2016-2017 that revolutionized the cultural shopping experience?

Diwali, the Festival of Lights, is not only a significant cultural celebration but also a major retail event in several countries. This shopping festival drives enormous revenue across multiple sectors as people purchase new clothes, home decorations, gifts, and sweets. Test your knowledge about this cultural retail phenomenon that bridges traditional practices with modern commerce!

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AR-enabled mobile apps allowing users to virtually place traditional diyas and decorations in their homes before purchase
UPI (Unified Payments Interface) digital payment system that transformed cash-heavy festival shopping into contactless transactions
Drone delivery of Diwali gift hampers to reduce traffic congestion during the festival season
AI-powered personal shopping assistants specialized in recommending culturally appropriate gifts based on family relations