单项选择题

下列程序段的输出结果是
  #include<iostream.h>
  void fun(int * X,int * y)
   cout < < * X < < * y;
    * X=3;
    * y=4;
  
  void main( )
   int x=1,y=2;
    fun(&y,&x);
    cout < < X < < y < < end1;

A.2143
B.1212
C.1234
D.2112