What is the domain of the function f(x) = (2x2 - x - 6)/(x2 + 4)?
A) (-[infinity], [infinity])
B) (-[infinity], -2) U (-2, 2) U (2, [infinity])
C) (-[infinity], -2) U (-2, 2)
D) (-[infinity], -2) U (2, [infinity])