Determine the implied domain of the following function. Express your answer in interval notation.
f(x) = 12/x
a. (-[infinity], 0) ∪ (0, [infinity])
b. (-[infinity], 0) ∪ (0, [infinity])
c. (-[infinity], 0] ∪ [0, [infinity])
d. (-[infinity], 0] ∪ [0, [infinity])