单选

进程P1、P2、P3、P4和P5的前趋图如下图所示：
若用PV操作控制进程P1、P2、P3、P4和P5并发执行的过程，则需要设置5个信号S1、S2、S3、S4和S5，且信号量S1～S5的初值都等于零。下图中c和d处应分别填写()。

A.P(S2)和P(S4)
B.P(S2)和V(S4)
C.V(S2)和P(S4)
D.V(S2)和V(S4)

试题出自试卷《2016年上半年软件设计师考试上午真题》

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进程P1、P2、P3、P4和P5的前趋图如下图所示： 若用PV操作控制进程P1、P2、P3、P4和P5并发执行的过程，则需要设置5个信号S1、S2、S3、S4和S5，且信号量S1～S5的初值都等于零。下图中c和d处应分别填写()。

进程P1、P2、P3、P4和P5的前趋图如下图所示：
若用PV操作控制进程P1、P2、P3、P4和P5并发执行的过程，则需要设置5个信号S1、S2、S3、S4和S5，且信号量S1～S5的初值都等于零。下图中c和d处应分别填写()。