单项选择题
How would the system administrator turn on Dynamic Processor Deallocation？（）
A.Use the diag menu to set dynamic deallocation to ’on’
B.Use the chdev command to enable the ’cpuguard’ attribute of sys0
C.Use the cfgmgr command to change the ’monitor’ attribute of proc0
D.Use the smitty command with the fast path dynamic_processor_deallocation to turn it on
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