K For the function below, find a) the critical numbers; b) the open intervals where the...

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K For the function below, find a) the critical numbers; b) the open intervals where the function is increasing; and c) the open intervals where it is decreasing. f(x) 12x3-9x2-108x+3 a) Find the critical number(s). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The critical number(s) is/are (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) B. There are no critical numbers. K For the function below, find a) the critical numbers; b) the open intervals where the function is increasing; and c) the open intervals where it is decreasing. f(x) 12x3-9x2-108x+3 a) Find the critical number(s). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The critical number(s) is/are (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) B. There are no critical numbers.