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【单选题】
以下叙述中,正确的是 。
A.
．进程调度原语主要是按一定的算法，从阻塞队列中选择一个进程，将处理机分配给它。
B.
．预防死锁发生可通过破坏死锁的四个必要条件之一来实现，但破坏互斥条件的可能性不大。
C.
．采用信号量同步机制的系统，进程进入临界区时要执行 V 原语
D.
．既考虑作业的等待时间，又考虑作业执行时间的调度算法称为电梯调度算法。
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