Which product recall holds the world record for the largest automotive recall in history, affecting approximately 100 million vehicles worldwide?

The world of retail has seen its fair share of spectacular successes and equally notable failures. Some product recalls have been so massive they've earned their place in the Guinness Book of World Records. Test your knowledge about the most significant product recalls in retail history that broke unfortunate records in terms of scale, cost, or impact.

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Takata airbag inflators
Ford Explorer/Firestone tires
General Motors ignition switches
Toyota accelerator pedals