Which innovative product development approach did NASA use for the James Webb Space Telescope's primary mirror that revolutionized large telescope design?

The James Webb Space Telescope (JWST) represents one of astronomy's most significant product development achievements. This technological marvel took decades to develop and represents cutting-edge innovation in space observation technology. Test your knowledge about this groundbreaking astronomical instrument that's changing our understanding of the universe!

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Using 18 hexagonal beryllium segments that unfold in space, allowing for a larger mirror than could fit in any rocket
Creating a single-piece diamond-coated mirror that was transported in segments and reassembled in orbit
Developing an inflatable mirror technology that expands to full size once deployed in space
Using nanobots to construct the mirror in space from raw materials transported on multiple launches