Threading Task forståelse

using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace E
{
    public class Program
    {
        private static string Any(int secs)
        {
            Thread.Sleep(secs * 1000);
            return Thread.CurrentThread.ManagedThreadId.ToString();
        }
        public static string One()
        {
            return Any(1);
        }
        public static string Two()
        {
            return Any(2);
        }
        public static string Three()
        {
            return Any(3);
        }
        public static void Test123()
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Task<string> one = Task<string>.Factory.StartNew(() => One());
            Task<string> two = Task<string>.Factory.StartNew(() => Two());
            Task<string> three = Task<string>.Factory.StartNew(() => Three());
            string oneres = one.Result;
            Console.WriteLine("One result in {0} ms in thread {1}", sw.ElapsedMilliseconds, oneres);
            string twores = two.Result;
            Console.WriteLine("Two result in {0} ms in thread {1}", sw.ElapsedMilliseconds, twores);
            string threeres = three.Result;
            Console.WriteLine("Three result in {0} ms in thread {1}", sw.ElapsedMilliseconds, threeres);
            Console.WriteLine("All result in {0} ms", sw.ElapsedMilliseconds);
        }
        public static void Test321()
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Task<string> one = Task<string>.Factory.StartNew(() => One());
            Task<string> two = Task<string>.Factory.StartNew(() => Two());
            Task<string> three = Task<string>.Factory.StartNew(() => Three());
            string threeres = three.Result;
            Console.WriteLine("Three result in {0} ms in thread {1}", sw.ElapsedMilliseconds, threeres);
            string twores = two.Result;
            Console.WriteLine("Two result in {0} ms in thread {1}", sw.ElapsedMilliseconds, twores);
            string oneres = one.Result;
            Console.WriteLine("One result in {0} ms in thread {1}", sw.ElapsedMilliseconds, oneres);
            Console.WriteLine("All result in {0} ms", sw.ElapsedMilliseconds);
        }
        public static void Test213()
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Task<string> one = Task<string>.Factory.StartNew(() => One());
            Task<string> two = Task<string>.Factory.StartNew(() => Two());
            Task<string> three = Task<string>.Factory.StartNew(() => Three());
            string twores = two.Result;
            Console.WriteLine("Two result in {0} ms in thread {1}", sw.ElapsedMilliseconds, twores);
            string oneres = one.Result;
            Console.WriteLine("One result in {0} ms in thread {1}", sw.ElapsedMilliseconds, oneres);
            string threeres = three.Result;
            Console.WriteLine("Three result in {0} ms in thread {1}", sw.ElapsedMilliseconds, threeres);
            Console.WriteLine("All result in {0} ms", sw.ElapsedMilliseconds);
        }
        public static void Main(string[] args)
        {
            Test123();
            Test321();
            Test213();
            Console.ReadKey();
        }
    }
}