Someone plz help!?!

The number of users of the internet in a town increased by a factor of 1.01 every year from 2000 to 2010. The function below shows the number of internet users f(x) after x years from the year 2000: f(x) = 3000(1.01)x Which of the following is a reasonable domain for the function?

A) 0 ≤ x ≤ 10

B) 2000 ≤ x ≤ 2010

C) 0 ≤ x ≤ 3000

D) All positive integers