Which innovative product design feature was specifically added to the Hubble Space Telescope after its launch to correct its initially flawed primary mirror?

The Hubble Space Telescope revolutionized not just astronomy but also how scientific products are designed for extreme environments. Its iconic design has influenced public perception of space exploration for decades. Test your knowledge about this groundbreaking product's development and its impact on both science and commercial space ventures.

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COSTAR (Corrective Optics Space Telescope Axial Replacement) - specialized corrective optics system
NICMOS (Near Infrared Camera and Multi-Object Spectrometer) - thermal cooling system
STIS (Space Telescope Imaging Spectrograph) - ultraviolet light filter array
WFC3 (Wide Field Camera 3) - digital imaging sensor upgrade