Which option describes the enhancements that SNMPv3 adds over 1 and 2 versions?

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

Answer: B

Explanation:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/configuration/guide/ffun_c/fcf014.h tml