阅读以下程序public class Shape{private string comments;protected string name;public string Name{ get{ return name;} set{name = value;}}public Shape(){}public Shape(string name){}public void Draw() {}}public class Rectangle:Shape{protected int width;protected int height;public int Width{get{return width;} set{width=value;}}public int Height{get{return height;} set{height=value;}}public Rectangle(){}public Rectangle(int cx,int cy){}public int ComputeArea(){}public void Print(){Console.WriteLine(name);//Line:1Console.WriteLine(Name);//Line:2Console.WriteLine(comments); //Line:3Draw();//Line:4}}以上程序中错误的是（）

A. Line:1
B. Line:2
C. Line:3
D. Line:4