A system administrator boots a server in normal mode, the boot process displays and LED 551 and stops. LED 551 indicates the root volume group is being varied on. All of the following are probable causes of the problem EXCEPT:（）
A.The bosboot command failed to complete.
B.The JFS log device is corrupted.
C.The initttab file is corrupted.
D.The /dev entries or /etc files are missing.