Regarding the description of SNMP, which of the following description is wrong?

Regarding the description of SNMP, which of the following description is wrong?
A . SNMP (Simple Network Management Protocol) is a simple network management protocol.
B . SNMP can be applied between the upper-and-lower layer network management, or between the device and the network management.
C . SNMP northbound structure includes OSS (Operating Support System) and Agent. SNMPA is a session layer protocol that specifies how to transfer management information between NMS and Agent.
D . The SNMP southbound protocol specifies how to transfer information between the U2000 and network element devices.

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Answer: C