(page 55 from out "Cracking the coding interview[...]" textbook): The following code computes the product of a and b. What is its runtime?

int product(int a, int b) { int sum = 0; for (int i = 0; i < b; i++) { sum += a; } return sum; }

Hint: in here you should give an answer for the big-Oh in terms of a and/or b, not n.

Please show work, code and, answer! Please also leave meaningful comments for what the code does. Thank you! I will be sure to upvote