A OceanStor V3 System "Alarm" shows there is a message: "SFP [0] Low Rx power alarm because Low Rx Pow ALM of SFP0 is detected", cause of the fault is:

A OceanStor V3 System "Alarm" shows there is a message: "SFP [0] Low Rx power alarm because Low Rx Pow ALM of SFP0 is detected", cause of the fault is:
A . equipment power distribution voltage is insufficient; the equipment is changed into DC power supply
B . power supply module power is insufficient, replace the power supply module
C . Board voltage is low or received optical power is low
D . The optical module buckles loose connections

Answer: C