分析下这个题目：Which of the following instructions should be privil

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分析下这个题目：Which of the following instructions should be privileged?答案是abcefh,请说明理由
1.8 Which of the following instructions should be privileged?
a.Set value of timer.
b.Read the clock.
c.Clear memory.
d.Issue a trap instruction.
e.Turn off interrupts.
f.Modify entries in device-status table.
g.Switch from user to kernel mode.
h.Access I/O device.

操作系统的题?应该问的是那些与内核指令相关的吧
a设置计时器的值,这个会影响系统进程,需要特权
b读时间,这个应该不需要吧,难道是读取操作系统时间?
c清除内存会影响进程调用,内存管理之类的,肯定也需要
d产生陷阱指令,这个任何指令都可以产生吧,不一定非内核指令
e关闭中断,这个会影响CPU占用,肯定要系统来控制
f编辑硬件状态表的记录,这个涉及硬件的管理,肯定要
g变用户到核心模式,可以修改核心指令那必须要
h存取I/O设备,这都是操作系统干的活,肯定要
完全个人理解,
再问：标准答案已经给了，就是不明白来求解释的，A class of instructions, usually including storage protection setting, interrupt handling, timer control, input/output, and special processor status-setting instructions,这是网上找的解释，b也许是timer control所以选了，g你选了，但答案没有唉，谢谢你的解答，给找个帮手解释一下吧，追加悬赏
再答：抱歉,没注意你的标准答案, 其实这道题很基础的,就是英文描述的太2了, READ CLOCK应该指的是读取设备是时钟频率,例如CPU CLOCK, 这个如果不通过内核指令是读不了的, 用户切换到核心模式，都是操作系统自动完成的,比如我发个存储文件的指令,在用户层可能就是SAVEFILE,在核心层就I/O驱动指令.但是切换的过程是不需要核心指令的,希望这个解释还算清楚

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