Which of the following initialization script. commands are essential if alarms of PTN
A.snmp-server trap-source 63.5.1.1 (MCC IP of NE)
B.snmp-server host (mng) 192.168.254.253(ip of EMS server) trap version 2c public udp-port 162
C.snmp packetsize 8192
D.snmp-server enable trap SNMP