Determine the domain of the following rational function: f(x) = \frac{(x + 4)(x - 9)}{(x + 1)(x - 6)(x +...

1. Determine the domain of the following rational function:
f(x) = \frac{(x + 4)(x - 9)}{(x + 1)(x - 6)(x + 4)}
A. (-∞, -4) ∪ (-4, 0) ∪ (6, ∞)
B. (-∞, -1) ∪ (-1, 4) ∪ (4, 9) ∪ (9, ∞)
C. (-∞, -4) ∪ (-4, -1) ∪ (-1, 6) ∪ (6, ∞)
D. (-∞, -1) ∪ (-1, 6) ∪ (6, ∞)