what is the answer and why

( f) None of the others local 2. (2 marks) Given that f(x) = -x2 + 12x - 28 has a relative maximum at x = 6, choose the correct statement. (a) f' is negative on the interval (6, co) local & absout. In-25191 (b) f' is negative for all real values None of the others (d) f' is negative on the interval (-0o, 6) (e) f' is positive on the interval (6, co) (f) f' is positive on the interval (-co, co) ersion B Mr. Flores Page 1