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

interface i1
{
    void fun();
}
interface i2
{
    void fun();
}
public class maths :i1, i2
{
    void i1.fun()
    {
        Console.WriteLine("i1.fun");
    }
    void i2.fun()
    {
        Console.WriteLine("i2.fun");
    }
}
class Program
{
    static void Main(string[] args)
    {
        Sample obj = new Sample();
        i1 i = (i1) obj;
        i.fun();
        i2 ii = (i2) obj;
        ii.fun();
    }
}

A. i1.fun

B. i2.fun
i1.fun

C. 0

D. i1.fun
i2.fun

Answer: Option D