单项选择题

Thenicevalueis60inthepslisting.Whichcommandisusedtochan……

The nice value is 60 in the ps listing. Which command is used to change this to a value of 20？（）

A. renice -n -20 {PID}
B. renice -n 20 {PID}
C. renice -n -40 {PID}
D. renice -n 40 {PID}

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