关于B787-9 early door function根据哪个传感器的信号进行主起舱门的提前作动？
A主起舱门关闭指示临近传感器(main gear door closed indication proximity sensor)
B主起减震支柱压缩传感器(MLG strut compress proximity sensor)
C主起小车收上临近传感器(MLG truck stowed proximity sensor)
D主起小车倾斜传感器（MLG truck tilt proximity sensor)