问题描述：
[单选]
某ZXONE8300设备开局中，LO2单板上报“后向缺陷指示SM-BDI告警”的原因是（）？During the deployment of ZXONE 8300， if the LO2 board reports the "Backward Defect Indication SM-BDI" alarm， then what is the possible reason？
A．本端LO2单板线路侧信号接收异常;Signal receiving on the line side of the local LO2 board is abnormal.
B．上游LO2单板线路侧信号接收异常; Signal receiving on the line side of the upstream LO2 board is abnormal.
C．本端客户侧信号接收异常;Signal receiving on the local client side is abnormal.
D．上游客户侧信号接收异常;Signal receiving on the upstream client side is abnormal.
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下一篇：某ZXONE8300设备开局中，CH1单板输出端口OAC上报“GFP客户信号失效告警”，请问可能的原因是（）。 During the deployment of ZXONE 8300， if the output port OAC of the CH1 board reports the "GFP Client Signal Failure" alarm， then what is the possible reason？
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