WhatisoneoftheprimaryoverheadfieldsassociatedwiththeOpticalPayloadUnit(OPU)?()
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A.pathmonitoring
B.tandemconnectionmonitoringactivationdeactivation(TCMACT)
C.PayloadStructureIdentifier(PSI)
D.multiframealignmentsignal(MFAS)
E.sectionmonitoring
参考答案: