So what we wanna do is the expression that gives us this area right over here under the rate curve. Well this is, our lower bound's going to be three and our upper bound is going to be four. And so there you have it. It is this first choice. You might have been tempted here if you got a little bit confused, hey maybe the fourth minute is after we've crossed that t is equal to four, but no, that would be the fifth minute. This would tell us, this would tell us our change over the first four minutes, not just during the fourth minute. And then this, well this is just gonna be zero.