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？（）

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.