If f(x) = 4 – x^2 and g(x) = 6x, which expression is equivalent to (g – f)(3)?

A: 6 – 3 – (4 + 3)^2

B: 6 – 3 – (4 – 3^2)

C: 6(3) – 4 + 3^2

D: 6(3) – 4 – 3^2