问题描述：
[单选]
电层子波长/波长1+1保护时必须将下列哪类单板APS通信使能关闭，否则上报告警过多会降低WASON处理效率。When configuring 1+1 protection for the sub-wavelength/wavelength on the electric layer， the APS communication of（）must be disabled; otherwise， WASON processing efficiency will be reduced due to excessive alarms．
A．客户侧单板; the client-side board
B．线路侧单板; the line-side board;
C．交叉板; the cross-connect board;
D．时钟单板; the clock board;
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上一篇：电层子波长/波长1+1保护时必须将下列哪类单板APS通信使能打开，否则告警不能触发保护倒换。In the case of electrical-layer sub-wavelength/wavelength 1+1 protection， APS communication of（）must be enabled; otherwise， protection switching cannot be triggered by alarms．
下一篇：电层子波长1+1保护建议单板的保护模式设置为（）？It is suggested that the board protection mode should be set to be（）in the case of electrical-layer sub-wavelength 1+1 protection．
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