单项选择题
During system boot， the boot process hangs at LED 0551. Which of the following is a likely cause（）
A.A network problem B.corrupted filesystem C.corrupted ODM D.corrupted /etc/inittab file
A.5 0 * * 6 /usr/local/bin/myscript B.6 * * 5 0 /usr/local/bin/myscript C.0 5 * * 6 /usr/local/bin/myscript D.0 5 6 * * /usr/local/bin/myscript
A.lsexport alpha B.showmount -e alpha C.exportfs -l alpha D.mount -e nfs alpha