Determine the domain of (g∘f)(x) if f(x)=x²−2x−4 and g(x)=1/x+1​.

a) {x ∈ ℝ}

b) {x ∈ ℝ | x ≠ -1}

c) {x ∈ ℝ | x ≠ -3, 1}

d) {x ∈ ℝ | x ≠ -3, -1, 1}