When conducting routine road inspections, how would you determine whether the parking brake is working properly?
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A
With the engine running at idle and the transmission in gear, it should be able to hold the bus stationary.
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B
When the accelerator is released while the vehicle is moving at 20 km/h, the parking brake should be able to stop it completely.
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C
When the engine is running at 1200 rpm and the transmission is in gear, it should be able to keep the bus stationary.
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D
All of the above.