现定义有一servlet： exam.ShowNumber，代码如下。package exam;@WebServlet("/ShowNumber")public class ShowNumber extends HttpServlet {private static final long serialVersionUID = 1L;public void service(HttpServletRequest req, HttpServletResponse resp)throws IOException {resp.setContentType("text/html;charset=GBK");PrintWriter out = resp.getWriter();String cmd = req.getParameter("cmd");out.println("");int sum=0;if (cmd.equals("odd")) {for (int i=0;i<10;i++) {if (i % 2!=0) out.print(i+" ");}} else {for (int i=0;i<10;i++) {if (i % 3==0) {out.print(i+" ");sum += i;}}out.println("sum="+sum);}out.println("
");out.println("");}}在浏览器地址栏内输入请求：http://localhost:8080/exam/ShowNumber?cmd=, 则浏览器显示结果：（ ）

A. 0 3 6 9 sum=18
B. 0 3 6 9
C. 1 3 5 7 9 sum=25
D. 1 3 5 7 9