多选题Which three of these are optical channel data unit （ODU） overhead fields？ （）Ageneral communication channel 0 （GCC0）Bsection monitoringCreserved （RES）Dgeneral communication channels 1 and 2 （GCC1 GCC2）Etandem connection monitoring activation deactivation （TCM ACT）
多选题
Which three of these are optical channel data unit （ODU） overhead fields？ （）
A
general communication channel 0 （GCC0）
B
section monitoring
C
reserved （RES）
D
general communication channels 1 and 2 （GCC1 GCC2）
E
tandem connection monitoring activation deactivation （TCM ACT）
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