What SNMP message alerts the manager to a condition on the network?（）

A.It is locally significant and must be the same throughout an area
B.It is globally significant and is used to represent the AS number
C.It is locally significant and is used to identify an instance of the OSPF database
D.It is globally significant and is used to identify OSPF stub areas

A.network 0.0.0.0 255.255.255.255 area 0
B.network 0.0.0.0 0.0.0.0 area 0
C.network 255.255.255.255 0.0.0.0 area 0
D.network all-interfaces area 0