Which innovative marketing strategy did Celestron use in 1970 to revolutionize the telescope market when launching their C8 Schmidt-Cassegrain telescope?

The astronomy equipment market has seen many groundbreaking product launches that transformed how we observe the night sky. In the 1970s, one telescope company made history with an innovative marketing approach that changed amateur astronomy forever. This poll tests your knowledge of pivotal moments in astronomy retail history that shaped the industry as we know it today.

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They created the first direct-to-consumer telescope catalog with astrophotography samples taken by the actual product
They partnered with NASA to advertise telescopes used in the Apollo program
They introduced the first lifetime warranty and satisfaction guarantee for astronomy equipment
They launched the first astronomy equipment subscription service with monthly sky charts