单项选择题
A. authorization
B. data integrity
C. confidentiality
D. authentication
单项选择题 Whichthe basicauthenticationtypeisoptionalforaJ2EE1.4compliantwebcontainer？（）
单项选择题 Whenaddingaelementtoawebapplicationdeploymentdescriptor，theinclusionofwhichsub-elementrequiresthedefinitionofanerrorpage（）？
单项选择题 Whichsecuritymechanismcanbedirectedthroughtheelementinawebdeploymentdescriptor（）？