21.How will you complete the foreach loop in the C#.NET code snippet given below such that it correctly prints all elements of the array a?

int[][]a = new int[2][];
    a[0] = new int[4]{6, 1 ,4, 3};
    a[1] = new int[3]{9, 2, 7};
    foreach (int[ ] i in a)
    {
        /* Add loop here */
        Console.Write(j + " ");
        Console.WriteLine();
    }
A.foreach (int j = 1; j < a(0).GetUpperBound; j++)
B.foreach (int j = 1; j < a.GetUpperBound (0); j++)
C.foreach (int j in a.Length)
D.foreach (int j in i)
E.foreach (int j in a.Length -1)
Answer: Option D