Consider following schedules involving two transactions:
S1 : r1(X); r1(Y); r2(X); r2(Y); w2(Y); w1(X)
S2 : r1(X); r2(X); r2(Y); w2(Y); r1(Y); w1(X)
Which of the following statement is true?
(A) Both S1 and S2 are conflict serializable.
(B) S1 is conflict serializable and S2 is not conflict serializable.
(C) S1 is not conflict serializable and S2 is conflict serializable.
(D) Both S1 and S2 are not conflict serializable.
Answer: (C)
Explanation: 
S1 is not conflict serializable and S2 is conflict serializable.
So, option (C) is correct.
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