C# - How to declare or return an empty array

var empty = new int[] { };

using System;
 
namespace Zuga.net
{
    class Program
    {
        static void Main(string[] args)
        {
            // 1. Use the Collection initializer
            var empty1a = new int[] { };
            int[] empty1b = { };
 
            // 2. Specify a zero length
            var empty2 = new int[0];
 
            // 3. New in .NET 4.6
            var empty3 = Array.Empty<int>();
        }
    }
}