A.Uptothreeexternalauthenticationservertypescanbeusedsimultaneously. B.Onlyoneexternalauthenticationservertypecanbeusedsimultaneously. C.Ifthelocalpassworddatabaseisnotconfiguredintheauthenticationorder，andtheconfigured D. E.Ifthelocalpassworddatabaseisnotconfiguredintheauthenticationorder，andtheconfigured