When comparing the functions using the equations, which conclusion can be made? f(x) domain restricted to x ≤ 0, and f⁻¹(x) domain restricted to x ≤ 0.
a) x ≤ 0 for both the functions
b) x ≤ 0 for f(x), x ≤ 4 for f⁻¹(x)
c) x ≤ 0 for f(x), x ≥ 4 for f⁻¹(x)
d) x ≥ 0 for both the functions