If f(x) = 3x³ + x² - x - 12, what would be the list of possible rational roots? a) +- 1, 3, 1/2, 1/3, 1/4, 1/6, 1/12, 3/2, 3/4 b) + - 1, 2, 3, 4, 6, 12, 1/3, 2/3, 4/3 c) + - 1, 2, 3, 4, 6, 12 d) 1, 2, 3, 4, 6, 12, 1,3, 2/3, 4/3​