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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) = 1x +6 a) Find the critical number(s). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The critical number(s) is/are (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) O B. There are no critical numbers.Find the xvalues of all points where the function has any relative extrema. Find the value(s) of any relative extrema. f(x) = x2 3x + 4 Select the correct choice below and, if necessary, ll in any answer boxes within your choice. 0 A- The function has a relative maximum of D at x= D and a relative minimum of D at X: D. (Use a comma to separate answers as needed.) 0 3- There are no relative maxima. The function has a relative minimum of D at x = D. (Use a comma to separate answers as needed.) 0 C- There are no relative minima. The function has a relative maximum of D at x = D. (Use a comma to separate answers as needed.) 0 D. There are no relative extrema