给定如下Servlet代码：假定在浏览器中输入URL：http://localhost:8080/servlet/HelloServlet，可以调用这个servlet，那么这个Servlet的输出是import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class HelloServlet extends HttpServlet{public void service(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException{}public void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException {res.setContentType(""text/html"");PrintWriter out = res.getWriter();out.println("""");out.println("""");out.println(""doGet Hello World!"");out.println("""");out.println("""");out.close();}public void doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException {res.setContentType(""text/html"");PrintWriter out = res.getWriter();out.println("""");out.println("""");out.println(""doPost Hello World!"");out.println("""");}}

A. 一个HTML页面，页面上显示doGet Hello World!
B. 一个HTML页面，页面上显示doPost Hello World!
C. 一个空白的HTML页面
D. 错误信息