Estimate the x-coordinates at which the relative maxima and relative minima occur for the function. f(x) = 3x3 + 9x2 – 1

A)The relative maximum is at x = 2, and the relative minimum is at x=1.
B)The relative maximum is at x = –2, and the relative minimum is at x=1.
C)The relative maximum is at x = –2, and the relative minimum is at x=0.
D)The relative maximum is at x = –2, and the relative minimum is at x=0.