Which three web application deployment descriptor elements allow web components to gain references toresources or EJB components？（）

WhichthreearevalidURLmappingstoaservletinawebdeployment...

多项选择题Which three are valid URL mappings to a servlet in a web deployment descriptor？（）

Given the security constraint in a DD： 101.<security-co...

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？（）

Given this fragment in a servlet： 23.if（req.isUserInRol...

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？（）