Which automotive recall, announced in 2009-2010, became one of the largest in history and involved issues with unintended acceleration?

The transportation industry has seen numerous product recalls over the decades, some of which have become landmark cases that changed safety standards and manufacturing practices. This trivia question tests your knowledge about one of the most significant automotive recalls in history - a case that fundamentally altered how vehicle safety is approached in the industry.

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Toyota's acceleration pedal recall, affecting approximately 9 million vehicles worldwide
Ford's Pinto fuel tank recall, affecting 1.5 million vehicles
General Motors' ignition switch recall, affecting 2.6 million vehicles
Volkswagen's emissions software recall, affecting 11 million diesel vehicles