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Consider the following two transactions:
T13: read(A); read(B); if A = 1 then B := B - 1; write(B).
T14: read(B); read(A); if B = 1 then A := A - 1; write(A).
Let the consistency requirement be A = 1 or B = 1, with A = 1 and B = 1 as the initial values.
a. Show that every serial execution involving these two transactions preserves the consistency of the database.
b. Show a concurrent execution of T13 and T14 that produces a non-serializable schedule.
c. Is there a concurrent execution of T13 and T14 that produces a serializable schedule?
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