To query the CPU utilization of a certain device through SNMP, before executing the query action, which information should be mastered by the network management application

To query the CPU utilization of a certain device through SNMP, before executing the query action, which information should be mastered by the network management application
A . SNMP community attributes of the device
B . The management IP address of the device
C . OID of device CPU utilization
D . Instance ID of device CPU utilization

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Answer: ABCD