Which of the following features became mandatory in 1964?

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Seatbelts were earlier an optional add-on and people often skipped them as an unnecessary expense until they were made mandatory. Many people believed this was pushed by the automakers to increase seatbelt sales.
Barrett-Jackson via Getty Images
Barrett-Jackson via Getty Images
Which of the following features became mandatory in 1964?
- Seatbelt
- Power Steering
- Power Brakes
- Airbags
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