Which innovative product design feature allows the James Webb Space Telescope to maintain the ultra-cold temperatures required for its infrared observations?

The James Webb Space Telescope (JWST) represents one of humanity's greatest product design achievements in astronomy. This revolutionary observatory required solving unprecedented engineering challenges to create an instrument capable of observing the universe in infrared wavelengths with unprecedented clarity. Test your knowledge about the product design innovations that made this astronomical marvel possible!

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A five-layer tennis court-sized sunshield that can block the heat of the Sun and reduce temperatures by over 600°F
A liquid nitrogen cooling system that continuously circulates coolant through the telescope's instruments
A series of thermoelectric cooling panels that convert solar energy into cooling power
An aluminum heat sink system that radiates excess heat through specialized vents on the telescope's exterior