多项选择题
Which two security mechanisms can be directed through a sub-element of the element in a web application deployment descriptor？（）
A.Authorization B.Data integrity C.Confidentiality D.Authentication
单项选择题 Whichsecuritymechanismusestheconceptofarealm？（）
单项选择题 WhichbasicauthenticationtypeisoptionalforaJ2EE1.4compliantwebcontainer？（）
多项选择题 Whichtwoarevalidvaluesfortheelementinsideaelementofawebapplicationdeploymentdescriptor？（）
