Which IoT technology was first widely adopted by major sports stadiums to revolutionize the fan experience?

In recent years, professional sports venues have undergone remarkable technological transformations to enhance fan experience. From mobile ordering systems to biometric entry, IoT connectivity has revolutionized how fans interact with stadiums. This poll tests your knowledge about a significant IoT innovation that changed how sports venues operate and connect with fans. Can you identify the groundbreaking technology that first gained widespread adoption?

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High-density WiFi networks with stadium-specific apps for navigation, ordering, and instant replays
Facial recognition entry systems for ticketless access and personalized greetings
RFID-embedded merchandise that unlocks special content when scanned with smartphones
Augmented reality displays on seats showing player statistics when viewed through smartphone cameras