单选题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>

题目
单选题
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>

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