Which environment variable must be changed in a user’s profile so that upon login， the command prompt identifies the server？（）

A.no -p ’core=-1’ webapp
B.chuser ’core=-1’ webapp
C.setsenv -attr ’core=unlimited’ webapp
D.chsec -f ’/etc/security/limits’ ’core=-1’ webapp

A.chsec
B.chusr
C.passwd
D.chgusrprf

A./etc/security/user
B./etc/security/passwd
C./etc/security/mkuser.sys
D./etc/security/mkuser.default