Find the vertical, horizontal, and oblique asymptotes, if any, for $f(x) = \frac{3x^3 + 20x^2 + 14x - 65}{x^2 + 8x + 15}$.
vertical: $x = 5, x = 3$
slant: $y = 3x + 4$
vertical: $x = -5, x = -3$
slant: $y = 3x - 4$
vertical: $x = -5, x = 3$
horizontal: $y = 0$
horizontal: $y = 0$
slant: $y = 3x - 4$