单项选择题
WhichstatementsistrueaboutPredictiveFailureAnalysis（PFA）forSystemxservers？（）
A.PFAisembeddedinselectedservercomponentsandrequiresnoactionforbeingenabled
B.PFAisavailableonlywhentheServerPlusPackisinstalledontheserver
C.PFAisavailableonlywhenaVirtualMediaKeyispresent
D.PFAisavailablewhentherelatedsettingisturnedoninUEFIsettings