Which product marketing strategy by Celestron revolutionized the amateur telescope market in the early 2000s?

In the competitive world of astronomy equipment, certain product developments have revolutionized how amateur astronomers engage with the night sky. One particular company made a groundbreaking marketing decision that transformed telescope accessibility for the mass market. Test your knowledge of this pivotal moment in astronomy retail history that helped bring stargazing to millions of new enthusiasts worldwide.

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Introduction of the NexStar computerized mount system with 'SkyAlign' technology that allowed automatic star alignment without knowledge of constellations
Partnership with National Geographic to create budget telescopes with celebrity astronomer endorsements
Development of the first smartphone-controlled telescope with built-in astrophotography capabilities
Launch of a subscription model where customers received upgraded optics every two years while maintaining the same telescope body