Which innovative product development approach did NASA use when creating the James Webb Space Telescope that significantly departed from traditional telescope design?

The astronomy industry has seen remarkable product development strategies over the decades, particularly in telescope technology. Major observatories and space agencies invest billions in creating cutting-edge instruments that expand our understanding of the cosmos. This poll tests your knowledge about one of astronomy's most significant product innovation case studies - the development process behind a revolutionary space telescope that changed how we view our universe.

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Implementing a folding, segmented primary mirror design that could unfold in space, solving the size limitations of rocket fairings
Using conventional glass mirrors with traditional cooling systems adapted from the Hubble Space Telescope's design
Developing a single-piece beryllium mirror that didn't require assembly in space, reducing deployment risks
Placing the telescope in Earth orbit for easy servicing and upgrades, following the successful Hubble maintenance model