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單項(xiàng)選擇題
A system is being booted into maintenance mode due to root password recovery.After accessing the root volume group and starting a shell without mounting the file systems, what is the next step?（）
A.Delete root's password from the /etc/security/passwd file
B.Use the diag recovery tool option to reset root's password
C.Execute the ‘passwd’ command and assign a new passwd to root UID
D.Mount the / and /usr filesystems on alternative mount points to edit the password file
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