using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Array a = null, b = null, c = null, d = null;

        if((new [] {a, b, c, d}).All(_ => _ != null)) {

            Console.WriteLine("None of the arrays are null");

        } else {

            Console.WriteLine("One or more of the arrays is are null");

        }

    }

}