What is the time complexity of the above nested loops?

public class NestedLoop {
    public static void main(String[] args) {
        int[][] arr = new int[rows][cols]; // assume dimensions: n rows and m columns
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[0].length; j++) {
                for (int k = 0; k < j; k++) {
                    // constant time operation
                    int temp = arr[i][j] + k;
                }
            }
        }
    }
}