Which option describes the enhancements that SNMPv3 adds over 1 and 2 versions?
A. Predefined events that generate message from the SNMP agent to the NMS
B. Addition of authentication and privacy options
C. Cleartext transmission of data between SNMP server and SNMP agent
D. Addition of the ability to predefine events using traps
E. Pooling of devices using GET-NEXT requests
F. Use of the object identifier
