单项选择题

采用下图的所示的传感器用于工件的检测。工件在入料口时,白金壳工件会置位标志位M4.1;工件光纤式接近开关1正下方时,白金芯工件会置位标志位M4.2;工件经过电感式接近开关后,金属工件会置标志位M4.3。怎么表示黑壳黑芯工件?
A、M4.1=M4.2=M4.3=0
B、M4.1=M4.2=M4.3=1
C、M4.1=M4.2=1且M4.3=0
D、M4.1=0且M4.2=M4.3=1

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