给定一个Servlet的代码片段如下：public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{________________________________________out.println(“hi kitty!”);out.close();}运行这个Servlet时输出如下：hi kitty!则应在此Servlet下划线处填充如下代码（ ）。

A. PrintWriter out = response.getWriter();
B. PrintWriter out = request.getWriter();
C. OutputStream out = response.getOutputStream();
D. OutputStream out = request.getWriter();