The number of members in an organization since the year 2000 can be represented by the function below, where x represents the number of years after 2000.

m(t) = 12 + 291x + 5

Which statement best describes the term 5?
1) the number of members that joined in 2001
2) the maximum number of members
3) the number of members in the year 2000
4) the average increase of members per year