题目:以下哪些方法可以获取RequestDispatcher对象()
A. RequestDispatcher dispatcher = request.getRequestDispatcher("/ResultServlet");
B. RequestDispatcher dispatcher =this.getServletContext().getRequestDispatcher("/ResultServlet");
C. RequestDispatcher dispatcher =this.getServletContext().getNamedDispatcher("/ResultServlet");
D. RequestDispatcher dispatcher = request.getServletContext().getRequestDispatcher("/ResultServlet");
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