【单选题】
Which of the following encryption methods is often used along with L2TP?()
A、S/MIME
B、SSH
C、3DES
D、IPSec
A、S/MIME
B、SSH
C、3DES
D、IPSec
A、cat /proc/usr/lparchk B、cat /proc/ppc64/lparcfg C、/var/adm/tools/res_list D、/var/adm/tools/lparalloc