What is the interval of f(x) = (x 1)(x 2)(x 3)/(x3 + 6x2 + 11x+ 6) where f(x) is negative?

• A. (- , -3) (3, )
• B. (3, -2) (1, 1) (2, 3)
• C. (- , -3) (2, -1) (1, 2) (3, )
• D. (- , )