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
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
B
<auth-metod>
C
<auth-constraint>
D
<form-login-config>
E
<user-data-constaint>
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