need help with this 2d array problem

Replace the ADD CODE HERE below with the code to find the sum of the values on the diagonal from [O][O] to [num rows - 1][num rows - 1]. Print the sum. It should print 5. Save & Run Load History Show CodeLens 1 public class Test1 2 { 3 4 5 public static void main(String[] args) { int[][] array { {1,2,3},{-1, -2,-3},{4,5,6} }; 6 7 8 //ADD CODE HERE 9 10 } 11} 12 Matis it Atnaden