[QUESTION] Which version of this function is faster? Why?

Our goal is to fill a two-dimensional array with 1’s.

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace ToArrays
{
    public class Program
    {
        public const int Size = 10000;

        private static void Main()
        {
            BenchmarkRunner.Run<Program>();
        }

        [Benchmark]
        public void IxJ()
        {
            var array = new int[Size, Size];
            for (var i = 0; i < Size; i++)
            {
                for (var j = 0; j < Size; j++)
                {
                    array[i, j] = 1;
                }
            }
        }

        [Benchmark]
        public void JxI()
        {
            var array = new int[Size, Size];
            for (var i = 0; i < Size; i++)
            {
                for (var j = 0; j < Size; j++)
                {
                    array[j, i] = 1;
                }
            }
        }
    }
}

Could you say which version is faster and why?