[50 Points] Officials in a town use a function to analyze traffic patterns. The function uses the rate of traffic through an intersection where the domain represents the number of observed vehicles in a specified time interval. What would be the most appropriate domain for the function? 1.{... -2, -1, 0, 1, 2, 3, ...)}

2.{ -2, -1, 0, 1, 2, 3}

3.{0, ½, 1, 1½, 2, 2½}

4.{0, 1, 2, 3, … }