In CMPINF 401 we taught you that if you CAN write it in a loop you SHOULD use a loop instead of using recursion, especially on big input. Why? A: recursion is harder to write and therefore harder to debug always use the tool you know best B: recursion will run extremely slow even on tiny inputs. C: recursion uses up stack space proportional to the input size whereas loops don't D: they are all true A B C