Which audience engagement strategy first pioneered by London's National Theatre in 2009 transformed performing arts marketing and has since been adopted by theaters worldwide?

In today's competitive entertainment landscape, performing arts organizations are implementing innovative marketing strategies to attract new audiences and retain loyal patrons. This trivia question explores a groundbreaking audience engagement technique that revolutionized how theaters connect with their patrons. Test your knowledge of cutting-edge marketing in the performing arts world!

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NT Live: Broadcasting live performances to movie theaters globally
Dynamic pricing algorithms that adjust ticket costs based on real-time demand
Digital program notes delivered via augmented reality applications
Subscription-based streaming platforms for archived performances