Determine the domain of (g∘f)(x) if f(x)=x²−x−3 and g(x)=1/x+1.

a) {x ∈ ℝ | x ≠ -1}

b) {x ∈ ℝ | x ≠ -2, 1}

c) {x ∈ ℝ | x ≠ -2, -1, 1}

d) {x ∈ ℝ}