The function f(x) = (x - 9)² + 3 is not one-to-one. Restrict the functions domain and find its inverse.
o restricted domain: x ≥ 9; f⁻¹(x) = √x-9 + 3
o restricted domain: x ≤ 9; f⁻¹(x) = √x-9 + 3
o restricted domain: x ≥ 9; f⁻¹(x) = √x-3 + 9
o restricted domain: x ≥ 3; f⁻¹(x) = √x-3 + 9