3 Let f(x) = 7x - 3x8. Identify ALL relative extrema of y = f(x). O A. Relative minimum at x = 0 and relative maximum at x = 3 O B. Relative minimum at x = 3 only 0 0. Relative maximum at x = 3 only 0 D. Relative maximum at x = 0 and relative minimum at x = 3 O E. There are no relative extrema