Which product innovation strategy by Celestron in the 1970s revolutionized the amateur astronomy market by making Schmidt-Cassegrain telescopes more accessible?

In the world of astronomy, technological innovation has drastically changed both amateur and professional stargazing. This poll explores how one of the most significant product innovations in the astronomy industry disrupted the market and changed our view of the cosmos. Test your knowledge about the business side of astronomical equipment development!

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The C8 mass production model that reduced manufacturing costs by 80% while maintaining optical quality
The introduction of subscription-based telescope time-sharing programs at local observatories
The 'Celestron Rental' program that allowed astronomers to lease equipment instead of purchasing it outright
The development of disposable, single-use telescope optics that could be easily replaced when damaged