The first five terms of a sequence are 7, 10, 13, 16, and 19. Which of the following functions define this sequence for all integers n ≥ 1?

1. f(n) = 4 + 3n
2. f(n) = 3n + 7
3. f(n) = 7(3)^n-1
4. f(n) = 4(3)^n-1