Acustomeriscost－justifyingadvancedsoftwarefunctionsofseveraldisksubsystemvendors.WhichofthefollowingsoftwarefeaturesoftheStorwizeV7000areprovidedatnocharge?（）
A.EasyTier,FlashCopy,ThinProvisioning
B.EasyTier,ExternalVirtualization,FlashCopy
C.EasyTier,Metro/GlobalMirror,ThinProvisioning
D.Metro/GlobalMirror,FlashCopy,ExternalVirtualization