Whatdoesqospre－classifyprovidesinregardtoimplementingQoSoverGRE／IPSecVPNtunnels?()

A.enablesIOStocopytheToSfieldfromtheinner（original）IPheadertotheoutertunnelIPheader

B.enablesIOStomakeacopyoftheinner（original）IPheaderandtorunaQoSclassificationbeforeencryption，basedonfieldsintheinnerIPheader.

C.enablesIOStoclassifypacketsbasedontheToSfieldintheinner（original）IPheader

D.enablesIOStoclassifypacketsbasedontheToSfieldintheoutertunnelIPheader

E.enablestheIOSclassificationenginetoonlyseeasingleencryptedandtunneledflowtoreduceclassificationcomplexity