Which statement about SNMP is true?

A.
SNMP version 2 uses a proxy agent to forward GetNext message to SNMP version 3.

B.
SNMP version 2 supports message integrity to ensure that a packet has not been tampered
with in transit.

C.
Proxy agents were used only in SNMP version 1.

D.
SNMP version 3 supports encryption and SNMP version 2 support authentication.

E.
GetBulk messages are converted to GetNext messages by the proxy agent and are then
forwarded to the SNMP version 1 agent.