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

The James Webb Space Telescope (JWST) represents one of humanity's greatest achievements in product design and engineering. Launched in December 2021, this marvel of modern technology had to overcome numerous design challenges to function in the harsh environment of space. This poll tests your knowledge about the innovative design solutions that made this groundbreaking astronomical instrument possible.

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A system of 132 individual actuators that precisely adjust each mirror segment to within nanometers of accuracy
Magnetic interlocking panels that automatically snap into position when exposed to the vacuum of space
Shape-memory alloy components that return to their programmed position when reaching specific temperatures
Pressurized gas chambers that inflate and lock the mirror segments into their final configuration