The number of users of a cell tower in a small, developing town increased by a factor of 1.5 every year from 2010 to 2019. the function below shows the number of cell tower users, f(x), after x years from the year 2010:

f(x) = 5,000(1.5)x

which of the following is a reasonable domain for the function?

2,010 ≤ x ≤ 2,019

0 ≤ x ≤ 5,000

0 ≤ x ≤ 9

all positive integers