(a) (5 pts) There is a red & black tree in Fig. 2. The value on each node is its key value. The color of each node can be inferred by its color and shape (rectangles represent black 1 nodes and circles represent red nodes). Now you need to delete the node with key value 16, and draw the resulting red & black tree. 10 5 15 20 IN N Figure 2: (b) (5 pts) For the red & black tree in Fig. 2, delete the node with key value 5, and draw the resulting red & black tree. Note that your deletion should base on Fig. 2, not the resulting tree that you have for the previous question.