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[单选] M600设备不能实现下列哪种保护:Which of the following protections cannot be implemented by M600?()
A.1+1通道保护 (用OP板保护OTU故障和线路故障)1+1 channel protection (use the OP board to prevent the OTU fault and line failure) B.1+1通道保护(用带保护功能的OTU板,仅保护线路故障)1+1 channel protection (use the OTU board with the protection function to only prevent line failure) C.复用段1+1保护Multiplexer section 1+1 protection D.通道共享保护 Channel shared protection
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