Which innovative retail strategy propelled Celestron to become a market leader in consumer telescopes during the 1970s?

The astronomy industry has seen remarkable innovation from numerous companies over the decades. One particular pioneer revolutionized how amateur astronomers access the night sky. This poll tests your knowledge of astronomy retail brand history and how one company's innovative marketing approach transformed the telescope market. Do you know which revolutionary strategy launched this company to stardom in the astronomy product world?

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Their introduction of the first computerized 'GoTo' telescope mount system
The Schmidt-Cassegrain design that made powerful telescopes more compact and portable for amateur astronomers
Being the first to sell telescopes through television shopping networks
Pioneering the subscription model for telescope accessories and star charts