Which innovative telescope design feature, first implemented in the James Webb Space Telescope, represented a revolutionary breakthrough in space-based observatory product development?

In the world of astronomy, telescope design innovation has dramatically changed how we observe the universe. From Galileo's rudimentary instrument to today's advanced observatories, the evolution of telescope technology represents one of humanity's greatest product development achievements. This trivia question focuses on a groundbreaking design innovation that transformed astronomical observation capabilities. Test your knowledge of astronomy product development history!

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The hexagonal segmented primary mirror that can fold to fit in a rocket and unfold in space
The use of radio wave detection instead of visible light capture
The implementation of a perpetual motion power generation system
The ability to physically rotate the entire telescope structure for panoramic imaging