单选题What is one of the primary overhead fields associated with the Optical Payload Unit （OPU）？（）Apath monitoringBtandem connection monitoring activation deactivation （TCM ACT）CPayload Structure Identifier （PSI）Dmultiframe alignment signal （MFAS）Esection monitoring
单选题
What is one of the primary overhead fields associated with the Optical Payload Unit （OPU）？（）
A
path monitoring
B
tandem connection monitoring activation deactivation （TCM ACT）
C
Payload Structure Identifier （PSI）
D
multiframe alignment signal （MFAS）
E
section monitoring
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