State the domain of the function.
f(x) = (3x² + 15x) /(4x² - 24x + 32)
using interval notation.
a) (-[infinity], 4) ∪ (4, 8) ∪ (8, [infinity])
b) (-[infinity], 4) ∪ (8, [infinity])
c) (-[infinity], 4) ∪ (4, 8]
d) (-[infinity], 4) ∪ (4, 8)