Please solve for command design pattern. (Illustrate in (b) and (c) means that you have to draw sequence diagrams for the given operations.)

Assume accounts 1 and 2 exist and each has a balance of $0. Consider the following operations by our user 1. deposit 100 account 1 2. deposit 200 account 2 3. withdrawal 50 account 2 4. undo 5. transfer 50 from account 1 to account 2 6. undo 7. redo a) List the contents of the undo and redo stacks after the above commands have been performed. b) Illustrate the messages sent when operation 3, withdrawal 50 account 2, is processed. c) Illustrate the messages sent when operation 4, undo, is processed.