A only is correct.
Constant-velocity joints are able to transfer torque with zero angular velocity variation and near-zero vibration to the drive wheels at a constant rotational speed, while still accommodating the up-and-down movement of the suspension. In most cases, they are used in front wheel drive vehicles.
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Explanation:
Online Dictionary defines 'Operating System' as "the software that supports a computer's basic functions, such as scheduling tasks, executing applications, and controlling peripherals.''
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