A.abstract class Cat: Animal

{

abstract public void Move();

}

B.abstract class Cat: Animal

{

virtual public void Move(){Console.Write(Console.Write("Move!");)}

}

C.abstract class Cat: Animal

{

public void Move(){Console.Write(Console.Write("Move!");)};

}

D.abstract class Cat: Animal

{

public void Eat(){Console.Write(Console.Write("Eat!");)};

}