Given this code, what will be the output?

Given this code, what will be the output?

class Animal {
  public virtual string Sound() => "Some sound";
}
class Dog : Animal {
  public override string Sound() => "Bark";
}
class Cat : Animal {
  public override string Sound() => "Meow";
}
class Program {
  static void Main() {
    Animal[] pets = { new Dog(), new Cat(), new Animal() };
    foreach (var pet in pets) {
      System.Console.WriteLine(pet.Sound());
    }
  }
}