[ldioms of use]: Consider the transaction graph in the figure below: Rectangles represent transactions, empty circles represent fresh addresses, and filled in circles represent addresses controlled by the named entity (i.e., 'A' stands for Alice, 'B' stands for Bob, and 'C' stands for Carol). An edge labeled "change" means that the end node is the change address for that transaction (it can identified by the heuristics discussed in class). Note that not every transaction has an identified change address. a. Can an observer identify who was paid by Bob in the transaction marked (1)? Explain how or explain why they cannot be identified with certainty. Can an observer identify who paid Carol? Explain how or explain why she cannot be identified with certainty. b. change change O change change change change, change