The purpose of the low pressure cut－out switch is to _____.A.maintain liquid refrigerant a

The purpose of the low pressure cut-out switch is to _____.

A.maintain liquid refrigerant at the suction of the compressor

B.maintain a preset suction pressure to the compressor

C.start and stop the compressor at preset operating pressures

D.operate at minimum efficiency

请帮忙给出正确答案和分析，谢谢！