2D Array Traversal With Step

Consider the following method:

public void editArray(int[][] data) {
    for (int row = 0; row < data.length; row += 2) {
        for (int col = 0; col < data[row].length; col++) {
            data[row][col] = -data[row][col];
        }
    }
}

Given an array data initialized as follows:

{
  {-1, -2, -3}, 
  {4, 5, 6}, 
  {7, 8, 9}, 
  {10, 11, 12}
}

What will the array look like after the method execution?