【正确答案】 1、A,C,D,E    

【答案解析】the command will trap the level 4 till the most severe level ie; warning till emergency．
Code Severity Description
0 Emergency system is unusable
1 Alert action must be taken immediately
2 Critical Critical conditions
3 Error Error conditions
4 Warning Warning conditions
5 Notice normal but significant condition． I
6 Informational Informational message
7 Debug Debug-level message