单项选择题
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？（）
A.chain.forward（request， response）；
B.chain.doFilter（request， response）；
C.request.forward（request， response）；
D.request.doFilter（request， response）；
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