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];
        }
    }
}

An int[][] array, arr, is declared and initialized as follows.

int[][] arr = {
    {-1, -2, -3},
    {4, 5, 6},
    {7, 8, 9},
    {10, 11, 12}
};

What are the contents of arr after the method call editArray(arr) is executed?