Which innovative product design feature of the James Webb Space Telescope allowed it to overcome previous limitations in space observation technology?

The James Webb Space Telescope (JWST) represents one of astronomy's most significant product innovations in decades. Its development faced numerous challenges and delays but ultimately delivered groundbreaking technology that has transformed our ability to observe the cosmos. This poll tests your knowledge about this revolutionary product development journey in astronomy.

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Its folding honeycomb beryllium mirror array that could be compacted for launch and precisely unfolded in space
Its rotating carbon-fiber shell that creates artificial gravity for the internal components
Its liquid mercury primary mirror that can change shape to adapt to different observational needs
Its transparent aluminum housing that eliminates the need for thermal protection