(a) (5 points) Draw the merge-sort tree for an execution of the merge-sort algorithm on the input sequence: (2, 5, 16, 4, 10, 23, 39, 18, 26, 15) (like in Figure. 4.2). 85 24 63 45 17 31 96 50 85 24 63 45 17 31 96 50 85 2463 45 17 96 50 86868686 85) (24) (63) (4s) (17)(31) (96) (50