I am learning Big O notation in my algorithms class. I just done an online quiz for this week where we get a bunch of code blocks which we have to select the big O complexity for.

I got everything correct except this code block:

```
void printPairs(int[] arrX, int[] arrY) {
    for(int i = 0; i < arrX.length; i++) {
        for(int j = 0; j < arrY.length; j++) {
            System.out.println(arrX[i] + "," + arrY[j]);
        }
    }
}

```

I put in `O(N^2)` but I got it wrong which I am not sure why, there are two for-loops? And unfortunately I can not see the other options available or correct answer till the end of the week.