3. We have the following two transactions. T1: A=A+ 1, B=B+2 T2: A=A * 1, B =B * 2 Suppose A = 1 and B = 2 initially, and the system utilizes concurrency to improve the efficiency. (1) What are the possible values of A and B after T1 and T2. (2) Please use Shared Lock (S) and Exclusive Lock (X) to show a schedule, which is non- serializable with 2 Phase Locking. (Draw a figure of the schedule and show the wait-for graph)

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