What will be the output of the following code?

What will be the output of the following code?

class Parent {
    public virtual void Display() { Console.WriteLine("Parent"); }
}
class Child : Parent {
    public sealed override void Display() { Console.WriteLine("Child"); }
}
class GrandChild : Child {
    public override void Display() { Console.WriteLine("GrandChild"); }
}

Parent obj = new GrandChild();
obj.Display();