A construction crew is paving a road. The crew has already paved 1,000 square feet and can pave at a rate of 300 square feet of road per hour. The function f(x) = 300x + 1,000 represents this situation. What is f(3), and what does it represent?

A. 900 square feet; f(3) represents the number of additional square feet the construction crew has paved after 3 hours, not including the initial paved amount.
B. 900 square feet; f(3) represents the total number of square feet the construction crew has paved after 3 hours.
C. 1,900 square feet; f(3) represents the number of additional square feet the construction crew has paved after 3 hours, not including the initial paved amount.
D. 1,900 square feet; f(3) represents the total number of square feet the construction crew has paved after 3 hours.