.net流行面试试题（基础但重要）

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what output would you expect from the following code?

using System;
class A
{
    Public virtual void f(){Console.Write("A");}
}

class B:A
{
    Public override void f(){Console.Write("B");}
}
class C:B
{
}
class D:C
{
}
class Test
{
       static void Main()
      {
       D d=new D();
       A a=d:
       B b=d:
       C c=d;
       a.f();
       b.f();
      c.f();
      d .f();
}
}
}
}