3. (U \& G-required) [30 points] a) [10 points ] Show the steps taken by Mergesort to sort the list E,X,A,M,P,L,E in alphabetical order. b) [5 points] Is Mergesort a stable sorting algorithm? Justify your answer. c) [10 points ] Show the steps taken by Quicksort to sort the list E, X, A, M, P, L, E in alphabetical order. d) [5 points] Is Quicksort a stable sorting algorithm? Justify your