阅读以下说明，回答问题1至问题8。[说明]Linux 系统开机引导时首先启动内核，由内核检查和初始化硬件设备，载入设备的驱动程序模块，安装root文件系统，然后内核将启动一个名为init的进程。在init运行完成并启动其他必要的后续进程后，系统开始运行，引导过程结束。init进程启动时需要读取inittab配置文件，该文件确定init在系统启动和关机时的工作特性。典型的inittab文件内容见以下清单：inittab This file describes how the INIT process should set upthe system in a certain nm-level.Default nmlevel. The nmlevels used by RHS are:0 - halt (Do NOT set initdefault to this )1 - Single user mode2-Multiuser, without NFS (The same as 3, if you do not have networking)3 - Full multiuser mode4 - unused5-Xll6 - reboot (Do NOT set initdefault to this )id:5:initdefault:System initialization.si::sysinit:/etc/rc.d/rc.sysinit10:0:wait:/etc/rc.d/rc 011:1:wait:/ete/rc.d/rc 112:2:wait:/etc/rc.d/rc 213:3:wait:/etc/rc,d/rc 314:4:wait:/etc/rc.d/rc 415:5:wait:/etc/rc.d/rc 516:6:wait:/etc/rc.d/rc 6Trap CTRL-ALT-DELETEea::ctrlaltdel:/sbin/shutdown -t3 -r nowWhen our UPS tells us power has failed, assume we have a few minutesof power left. Schedule a shutdown for 2 minutes from now.This does, of course, assume you have powerd installed and yourUPS connected and working correctly.pf::power fail:/sbin/shutdown -f-h +2 "Power Failure: System Shutting Down"If power was restored before the shutdown kicked in, cancel it.pr: 12345:powerokwait:/sbin/shutdown-c "Power Restored; Shutdown Cancelled"Run gettys in standard rtmlevels1:2345 :respawn:/sbin/mingetty tty12:2345:respawn:/sbin/mingetty try23:2345 :respawn:/sbin/mingetty try34:2345:respawn:/sbin/mingetty tty45:2345:respawn:/sbin/mingetty tty56:2345 :respawn:/sbin/mingetty tty6Run xdm in runlevel 5x:5:respawn:/etc/X 11/prefdm -nodaemon启动init进程前，不需要经过______步骤。A．LIIO加载内核 B．检测内存C．加载文件系统 D．启动网络支持
阅读以下说明，回答问题1至问题8。
[说明]
Linux 系统开机引导时首先启动内核，由内核检查和初始化硬件设备，载入设备的驱动程序模块，安装root文件系统，然后内核将启动一个名为init的进程。在init运行完成并启动其他必要的后续进程后，系统开始运行，引导过程结束。init进程启动时需要读取inittab配置文件，该文件确定init在系统启动和关机时的工作特性。典型的inittab文件内容见以下清单：
inittab This file describes how the INIT process should set up
the system in a certain nm-level.
Default nmlevel. The nmlevels used by RHS are:
0 - halt (Do NOT set initdefault to this )
1 - Single user mode
2-Multiuser, without NFS (The same as 3, if you do not have networking)
3 - Full multiuser mode
4 - unused
5-Xll
6 - reboot (Do NOT set initdefault to this )
id:5:initdefault:
System initialization.
si::sysinit:/etc/rc.d/rc.sysinit
10:0:wait:/etc/rc.d/rc 0
11:1:wait:/ete/rc.d/rc 1
12:2:wait:/etc/rc.d/rc 2
13:3:wait:/etc/rc,d/rc 3
14:4:wait:/etc/rc.d/rc 4
15:5:wait:/etc/rc.d/rc 5
16:6:wait:/etc/rc.d/rc 6
Trap CTRL-ALT-DELETE
ea::ctrlaltdel:/sbin/shutdown -t3 -r now
When our UPS tells us power has failed, assume we have a few minutes
of power left. Schedule a shutdown for 2 minutes from now.
This does, of course, assume you have powerd installed and your
UPS connected and working correctly.
pf::power fail:/sbin/shutdown -f-h +2 "Power Failure: System Shutting Down"
If power was restored before the shutdown kicked in, cancel it.
pr: 12345:powerokwait:/sbin/shutdown-c "Power Restored; Shutdown Cancelled"
Run gettys in standard rtmlevels
1:2345 :respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty try2
3:2345 :respawn:/sbin/mingetty try3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345 :respawn:/sbin/mingetty tty6
Run xdm in runlevel 5
x:5:respawn:/etc/X 11/prefdm -nodaemon
启动init进程前，不需要经过______步骤。
A．LIIO加载内核 B．检测内存
C．加载文件系统 D．启动网络支持