How is the length 3 and the rank 1

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int[ ] arr = {2, 4, 7};

Console.WriteLine(arr.Length);

Console.WriteLine(arr.Rank);
}
}
}

Answer 1

length is 3 beause it has 3 items in array
rank is 1 because it is single dimensional array