Find a) any critical values and b) any relative extrema. F(x)=x^3-12x+18

b) Select the correct choice below and, if necessary, fill in the answer box(es) within your choice. A. The relative minimum point(s) is/are _________ and there are no relative maximum points. (Simplify your answer. Type an ordered pair, using integers or fractions. Use a comma to separate answers as needed.)

B. The relative maximum point(s) is/are ______ and there are no relative minimum points. (Simplify your answer. Type an ordered pair, using integers or fractions. Use a comma to separate answers as needed.)

C. The relative minimum point(s) is/are ______ and the relative maximum point(s) is/are _______ (Simplify your answers. Type ordered pairs, using integers or fractions. Use a comma to separate answers as needed.)

D. There are no relative minimum points and there are no relative maximum points.