What will be the output of the following C# code?

class a
{
    public  void fun()
    {
        Console.WriteLine("base method");
    }
}
class b: a
{
    public new void fun()
    {
        Console.WriteLine(" derived method ");
    }
}
class Program
{
    static void Main(string[] args)
    {
        b k = new b();
        k.fun();
        Console.ReadLine();
    }
}