WhichthreeofthesestatementsaboutPPPoEaretrue？（）

A.PPPoEcanprovideahostwithaccesstoadestinationoverEthernet.Youcanhaveonlyone PPPoE sessionperPVC B.YoumustinstallPPPoEclientsoftwareonallhoststhatconnecttotheEthernetsegment.Thismeans thattheaccessprovidermustmaintainaCPE C.YoucannotusePPPoEwithCiscoServiceSelectionGateway D.PPPoEimplementationissusceptibletobroadcaststormsandpossibledenial-of-serviceattacks E.Per-sessionaccountingispossible，whichallowstheserviceprovidertochargethesubscriberbased onsessiontimeforvariousservicesoffered.Theserviceprovidercanalsorequireaminimumaccess charge