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)= x+5 x+2 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.) OB. There are no critical numbers.