【C016109】若请求的URL中的参数uid非必须，则下列写法不满足要求的是（ ）。

• A.@RequestMapping(value="/list",method=RequestMethod.GET)
  
  public String list(@RequestParam(value="uid",required=true) String uid){
  
   return "user/userlist";
  
  }

• B.@RequestMapping(value="/list",method=RequestMethod.GET)
  
  public String list(@RequestParam("uid") String uid){
  
   return "user/userlist";
  
  }

• C.@RequestMapping(value="/list",method=RequestMethod.GET)
  
  public String list(String uid){
  
   return "user/userlist";
  
  }

• D.@RequestMapping(value="/list",method=RequestMethod.GET)
  
  public String list(@RequestParam(value="uid",required=false) String uid){
  
   return "user/userlist";
  
  }