During a conversation with the client, the nurse observes the client shaking his leg and tapping his fingers on the table next to him. The nurse’s best statement is.

A. "I’ll get you something to help you feel less anxious. "
B. "I know that you feel anxious. Let’s discuss something more pleasant. "
C. "I see that you’re anxious. I’ll be back later when you’re calmer. "
D. "I noticed that your leg is shaking and you’re tapping your fingers on the table. How are you feeling now"

某系统中进程有如图2-16所示的状态变化：

请回答下列问题：

该系统采用了怎样的进程调度算法说明理由。