请问AScool这个变量放在private和public以及var处的作用域是怎样?

代码如下:
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;type
  TSchool=class
  public
   Name:string;
   function GetKind:string;virtual;
  end;  THighSchool=class(TSchool)
  public
    ClassCounts:Word;
    function GetKind:string;override;
  end;  TUniversity=class(TSchool)
   public
    facultyCounts:word;
    function GetKind:string;override;
  end;
  TForm1 = class(TForm)
    RadioButton1: TRadioButton;
    RadioButton2: TRadioButton;
    RadioButton3: TRadioButton;
    Button1: TButton;
    procedure RadioButton1Click(Sender: TObject);
    procedure RadioButton2Click(Sender: TObject);
    procedure RadioButton3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure formcreate(Sender: TObject);
  private
   AScool:TSchool;(AScool放在private和public以及var处的作用域范围分别是怎样？TKS！！！）
  public  end;var
  Form1: TForm1;
implementation