单项选择题
Assuming the tag library in the exhibit is imported with the prefix forum， which custom tag invocation produces a translation error in a JSP page？（）
A.A B.B C.C D.D E.E
Whichthe securitymechanismusestheconceptofarealm？（）A. a...
单项选择题Which the security mechanism uses the concept of a realm？（）
A. authorization B. data integrity C. confidentiality D. authentication
Whichthe basicauthenticationtypeisoptionalforaJ2EE1.4co...
单项选择题Which the basic authentication type is optional for a J2EE 1.4 compliant web container？（）
A. HTTP Basic Authentication B. Form Based Authentication C. HTTP Digest Authentication D. HTTPS Client Authentication
Whenaddingaelementtoawebapplicationdeploymentdescriptor...
单项选择题When adding a element to a web application deployment descriptor， the inclusion of which sub-element requires the definition of an error page（）？
A. <realm-name> B. <auth-metod> C. <auth-constraint> D. <form-login-config> E. <user-data-constaint>
