Question

PLEASE HELP
What are the amplitude, period, phase shift, and midline of f(x) = -4 cos(3x - π) + 1?

A. amplitude: -4; period: π /3 ; phase shift: x = π /4 ; midline: y = -1

B. amplitude: 4; period: π/3 ; phase shift: x = π/4 ; midline: y = 1

C. amplitude: -4; period: 2π/3 ; phase shift: x = π/3 ; midline: y = -1

D. amplitude: 4; period: 2π/3 ; phase shift: x =π/3 ; midline: y = 1