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單項選擇題

Given the definition of MyServlet:
11.public class MyServlet extends HttpServlet {
12.public void service(HttpServletRequest request,
13.HttpServletResponse response)
14.throws ServletException, IOException {
15.HttpSession session = request.getSession();
16.session.setAttribute("myAttribute","myAttributeValue");
17.session.invalidate();
18.response.getWriter().println("value=" +
19.session.getAttribute("myAttribute"));
20.}
21.}
What is the result when a request is sent to MyServlet?()

A.An IllegalStateException is thrown at runtime.
B.An InvalidSessionException is thrown at runtime.
C.The string "value=null" appears in the response stream.
D.The string "value=myAttributeValue" appears in the response stream.

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