Which automotive recall was the largest in history by total number of vehicles affected worldwide?

Product recalls are a critical aspect of the transportation industry, often balancing consumer safety with brand reputation. This trivia question explores one of the most significant automotive recalls in history. While recalls can be costly for manufacturers, they demonstrate a commitment to customer safety and regulatory compliance. How well do you know the major safety recalls that have shaped the transportation industry?

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Toyota's unintended acceleration recall (2009-2011)
Takata airbag inflator recall (2013-ongoing)
General Motors ignition switch recall (2014)
Volkswagen diesel emissions scandal recall (2015)