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哪个消息是MGC发给MG的心跳消息?()

A.168.6.71]:2944Transaction=20{Context=-{AuditValue=ROOT{Audit{}}}}
B、!/1[192.168.6.71]:2944Transaction=5{Context=-{Auditcapability=A0{Audit{Media,packages}}}}
C、!/1[191.2.6.213]:2944Transaction=275{Context=-{Notify=ROOT{ObservedEvents=0{19700101T01153516:it/ito}}}}
D、!/1[192.168.1.119]:2944Transaction=2050{Context=-{AuditValue=ROOT{Audit{Package