Need help with 3 & 4. Thank you!

3. (5 points) Consider the following pivot selection schemes and discuss the complexity for random inputs, pre-sorted inputs, and reverse-order inputs. a. Scheme 1: Pick the first element as a pivot b. Scheme 2: Pick the last element as a pivot C. Scheme 3: Pick the center element as a pivot d. Scheme 4: Median-of-three pivot selection 4. (5 points) If you have to recommend only one pivot selection scheme from the list given in the previous problem. Which one do you recommend? Justify your