(a) On an initially empty red-black tree, perform the following operations in this order: insert(1), insert(3), insert(5), insert(6), insert(7), delete(1) Show all the intermediate steps of your work (b) We can get another sorting algorithm by first inserting all the keys into a red-black tree, and then performing an in-order traversal of the tree. What's the time complexity of this algorithm? (As always, use O or notation.)