The ATP system consists of ______________ and on-board equipment, supervising the train operation at a safe speed and ensuring the train’s immediate braking once it exceeds the specified speed. ATP系统由______________和车载设备组成，监督列车以安全速度运行，并确保列车在超过规定速度时立即制动。
A、braking equipment 制动设备
B、ground equipment 地面设备
C、signal equipment 信号设备