多项选择题 Given the security constraint in a DD： 101.<security-constraint> 102.<web-resource-collection> 103.<web-resource-name>Foo</web-resource-name> 104.<url-pattern>/Bar/Baz/*</url-pattern> 105.<http-method>POST</http-method> 106.</web-resource-collection> 107.<auth-constraint> 108.<role-name>DEVELOPER</role-name> 109.</auth-constraint> 110.</security-constraint> And given that "MANAGER" is a valid role-name，which four are true for this security constraint？（）

单项选择题 Given this fragment in a servlet： 23.if（req.isUserInRole（"Admin"）） { 24.// do stuff 25.} And the following fragment from the related Java EE deployment descriptor： 812.<security-role-ref> 813.<role-name>Admin</role-name> 814.<role-link>Administrator</role-link> 815.</security-role-ref> 900.<security-role> 901.<role-name>Admin</role-name> 902.<role-name>Administrator</role-name> 903.</security-role> What is the result？（）

多项选择题 If you want to use the Java EE platform’s built-in type of authentication that uses a custom HTML page for authentication. Which two statements are true？（）