单项选择题
WhichstatementistrueabouttheSDMQoSwizardanditsabilitytoenableaQoSpolicyonrouterinterfaces?()
A.QoScanbeenabledoninterfacesusedforEasyVPNclients
B.QoScanbeenabledonIPsecVPNinterfacesandtunnels
C.QoScanbeenabledoninterfaceswithanexistingQoSpolicy
D.theQoSpolicycanbeenabledforincomingandoutgoingtrafficontheinterface