What innovative product development solution did NASA implement to fix the Hubble Space Telescope's initially flawed mirror?

The Hubble Space Telescope represents one of the most significant product innovations in astronomy. Since its launch in 1990, it has transformed our understanding of the universe despite a major early setback. This trivia question explores a critical aspect of the telescope's development history that demonstrates how product innovation can overcome significant challenges to create groundbreaking scientific tools.

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COSTAR (Corrective Optics Space Telescope Axial Replacement) - specialized corrective optics installed during a space shuttle mission
Remote Software Calibration - adjusting the telescope's image processing algorithms from Earth to compensate for the mirror flaw
Adaptive Mirror Technology - installing self-adjusting mirror components that could correct their own curvature
Complete Mirror Replacement - removing and replacing the entire primary mirror during an unprecedented space repair mission