Which major astronomical product development allowed amateur astronomers to compete with professional observatories in the 1990s-2000s?

Product development in astronomy has led to revolutionary technologies and tools that have transformed our understanding of the universe. From the first telescopes to modern space-based observatories, the journey of astronomical product innovation is filled with fascinating milestones. This trivia question focuses on a pivotal moment in astronomical product development that changed how we observe our universe. Test your knowledge about when cutting-edge technology met astronomical discovery!

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CCD (Charged-Coupled Device) imaging technology becoming affordable for consumer telescopes
Development of radio astronomy kits for backyard observatories
Introduction of the first smartphone-controlled automated telescopes
Mass production of adaptive optics systems for amateur telescopes