YoudeploymobiledevicesthatrunMicrosoftWindowsMobile5.0.AMicrosoftWindowsServer2003serverth

YoudeploymobiledevicesthatrunMicrosoftWindowsMobile5.0.AMicrosoftWindowsServer2003serverthatrunsRoutingandRemoteAccessisconfiguredtoallowvirtualprivatenetwork（VPN）connectionsthatareassecureaspossible.YouneedtoconnecttheWindowsMobilebaseddevicestotheVPNserver.YoualsoneedtoensurethatbothendsoftheVPNtunnelareauthenticated.Whichtwoactionsshouldyouperform？（）

A.SelectL2TP/IPSeconeachWindowsMobilebaseddevice.

B.ObtainandinstallacertificateoneachWindowsMobilebaseddevice.

C.Configuretheappropriatepre-sharedkeyoneachWindowsMobilebaseddevice.

D.SelectPoint-to-PointTunnelingProtocol（PPTP）oneachWindowsMobilebaseddevice.