Concurrency control mechanism

2" (20%)Given the following schedule without con currency control mechanism: s-[T1 :R(A), T2:R(B), T3:R(C), T2 :R(C), T3:R(B) T ?:W(A), T2:W(C), T3:W(B)]. Please describe: the two-phase locking protocol, (a) (b) According to the answer above, what is the problem under the two-phase locking protocol ? the timestamp-based protocol. (c)