Which element of a web application deployment descriptor  element is required？（）

Given a Filter class definition with this method：
21.public void doFilter（ServletRequest request，
22.ServletResponse response，
23.FilterChain chain）
24.throws ServletException， IOException {
25.// insert code here
26.}
Which should you insert at line 25 to properly invoke the next filter in the chain， or the target servlet if thereare no more filters？（）

You need to create a JSP that generates some JavaScript code to populate an array of strings used on the client-side.
Which JSP code snippet will create this array？（）

Click the Exhibit button.

The attribute "name" has a value of "Foo，"
What is the result if this tag handler’s tag is invoked？（）