【C016054】在SpringMVC中，REST风格的SpringMVC Controller 传递多个参数时，以下哪些代码可以胜任此项工作（）。

• A.@RequestMapping(value="/{username}/update",method=RequestMethod.GET)  
  
  public String update(@PathVariable String username, Model model){
  
         System.out.println("获取到传入的参数值为:" + username);
  
         model.addAttribute(users.get(username));
  
         return "user/update";
  
  }

• B.public String update(@PathVariable String username, Model model){
  
         System.out.println("获取到传入的参数值为:" + username);
  
         model.addAttribute(users.get(username));
  
         return "user/update";
  
  }

• C.@RequestMapping(value="/{username}/update",method=RequestMethod.GET)  
  
  public String update(Model model){  
  
         System.out.println("获取到传入的参数值为:" + username);  
  
         model.addAttribute(users.get(username));  
  
         return "user/update";  
  
  }

• D.@RequestMapping(value="/{username}/update",method=RequestMethod.GET)  
  
  public String update(@PathVariable String username, Model model){
  
  }