Which innovative retail strategy did Celestron employ in 2014 that revolutionized telescope sales by making astronomy more accessible to beginners?

The astronomy industry has seen remarkable retail innovations that have transformed how people engage with the night sky. From specialized telescopes to sophisticated star-tracking apps, companies have competed to bring the cosmos closer to consumers. This poll tests your knowledge about one of the most influential product launches that revolutionized amateur astronomy and created a new market segment. Can you identify the correct marketing strategy that led to this astronomical retail success?

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The NexStar Evolution series with built-in WiFi and smartphone control, eliminating complex star alignment procedures
The SkyProdigy automated calibration system that used military-grade GPS technology to locate celestial objects
The StarSense Explorer subscription model that offered monthly delivery of new eyepieces and viewing guides
The Universe Unlimited program that allowed customers to trade in telescopes for upgraded models annually