Which innovative product design feature allows the James Webb Space Telescope's primary mirror to fold for launch and then unfold in space?

The James Webb Space Telescope (JWST) represents one of the most complex product design challenges ever undertaken in astronomy. This engineering marvel required innovations in materials, optics, and thermal management to create an observatory that can peer further into the universe than ever before. Test your knowledge about the design decisions that made this revolutionary astronomical instrument possible!

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The mirror is made of 18 hexagonal beryllium segments with mechanical actuators that enable precise alignment after deployment
The mirror uses a flexible polymer coating that can be electronically reshaped to different configurations after deployment
The mirror is constructed from a single piece of special glass that becomes malleable at specific temperatures in space
The mirror uses NASA's proprietary memory metal technology that automatically unfolds when exposed to sunlight