Forty subjects are recruited in the study. Each subject recruited in the study has to drive with and without a cellphone. The drives with and without cell phone are scheduled for two different days. The two treatments (with and without cellphones) are assigned randomly as follows: On the first day, twenty subjects are randomly chosen to drive with cell phones, and the remaining twenty to drive without cell phones. The next day, those who drove without cellphones drive with cellphones and vice versa. What kind of experiment design is this? Choose the best answer.

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