假设某计算机系统中只有一个CPU、一台输入设备和一台输出设备，若系统中有四个作业T1、T2、T3和T4，系统采用优先级调度，且T1的优先级>T2的优先级>T3的优先级>T4的优先级。每个作业Ti具有三个程序段：输入Ii、计算Ci和输出Pi（i=1，2，3，4），其执行顺序为Ii→Ci→Pi。这四个作业各程序段并发执行的前驱图如下所示。图中①、②分别为（ ），③、④、⑤分别为（ ）。
问题1选项
A.I2、P2
B.I 2、C2
C.C1、P2
D.C1、P3
问题2选项
A.C2、C4、P4
B.I 2、I 3、C4
C.I3、P3、P4
D.I 3、C4、P4
正确答案及解析
正确答案
解析
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