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The answer is B becausePower brakes are a system of hydraulics used to slow down or stop most motor vehicles. It uses a combination of mechanical components to multiply the force applied to the brake pedal by the driver into enough force to actuate thebrakes and stop a vehicle that can weigh several tons.
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A network backbone connects multiple networks together, allowing them to communicate with each other.
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You didn't give any choice as it looks a multiple choice question
