某文件的组外成员的权限为只读；所有者有全部权限；组内的权限为读与写，则该文件的权限为（）

A./home/jerry
B./bin/jerry
C./var/jerry
D./etc/jerry

A./etc/conf
B./etc/lilo.conf
C./proc/kcore
D./usr/local/

A.cp myfile  /dev/null
B.touch myfile
C.create myfile
D.mkfile myfile