【C016106】通过请求URL（http://localhost:8080/springmvcpro/index?uname=test），注：springmvcpro为项目工程名，显示welcome.jsp页面，并在该页面上输出参数uname的值，请补全下列关键代码：（ ）。

@Controller

public class IndexController {

@RequestMapping(value="___(1)___ ")

public ModelAndView index(String uname){

  ModelAndView modelAndView  = new ModelAndView();

  ________(2)___________

  ________(3)___________

  return modelAndView;

}

}

DispatchServlet-servlet.xml配置文件：

...

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

  <property name="prefix" value="/WEB-INF/jsp/"/>

  <property name="suffix" value=".jsp"/>

</bean>

…

• A./ index
  
  modelAndView.setViewName("index"); 
  
  modelAndView.addObject(uname);

• B./ welcome
  
  modelAndView.setViewName("index.jsp"); 
  
  modelAndView.addObject(uname);

• C./springmvcpro/index
  
  modelAndView.setViewName("welcome.jsp"); 
  
  modelAndView.addObject(uname);

• D./ index
  
  modelAndView.setViewName("welcome"); 
  
  modelAndView.addObject(uname);