Please explain in detail.

What is the output of the following code?

 public class Test { public static void main(String[] args) { int[][] x = {{2, 1}, {1, 7, 1}}; System.out.println(m(x[1])); } public static int m(int[] m) { int result = 0; for (int i = 0; i < m.length; i++) result += m[i]; return result; } }