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Time stamp

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S; R2(A),R3(A),W2(B),W3(A),R1(B),R4(B),R1(A),W1(C),W4(A)

what are transactions rollbacks if the above schedule is executed by using timestamp with thomas write rule

(assume timstamps as t1=250,t2=200, t3=210, t4=275)

a)t1

b)t2

c)t4

d)no rollbacks
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