Which audience sentiment analysis technique revolutionized Broadway theaters' understanding of audience engagement during performances in the 2010s?

The performing arts industry has embraced technology to better understand audience engagement and satisfaction. Modern theaters and performance venues now employ sophisticated analytics tools to measure audience sentiment and enhance the overall experience. Test your knowledge of how product management principles are applied in the performing arts sector to analyze and improve the audience journey.

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Biometric wristbands that measured physiological responses like heart rate and skin conductance during key performance moments
Exit surveys with QR codes that offered discounted merchandise for participation
Facial recognition cameras that tracked emotional responses throughout performances
Mobile app heatmaps that tracked which scenes audiences rewatched most frequently in digital performances