Determine the domain and range of (g∘f)(x) if f(x)=4/x²−4 and g(x)=x².

a) D: {x ∈ ℝ | x ≠ 2, -2} and R: (-[infinity], 1) ∪ (2, [infinity])

b) D: {x ∈ ℝ | x ≠ 4, 0} and R: (-[infinity], 2) ∪ (2, [infinity])

c) D: {x ∈ ℝ | x ≠ 4, -2, 0, 2} and R: (-[infinity], 1) ∪ (2, [infinity])

d) D: {x ∈ ℝ} and R: (-[infinity], 2) ∪ (2, [infinity])