Use the graph below to answer the question that follows: trig graph with points at 0, 0 and pi over 2, negative 4 and pi, 0 and 3 pi over 2, 4 and 2 pi, 0 and 5 pi over 2, negative 4 and 3 pi, 0 what trigonometric function represents the graph? (6 points) a. f(x) = 4 sin(x − pi over 2 ) b. f(x) = −4 sin(x − pi over 2 ) c. f(x) = 4 cos(x − pi over 2 ) d. f(x) = −4 cos(x − pi over 2 )