T1 : r1(x) ,r1(z) , r1(y) , w1(z)
T2: r1(z) , r1(x) , r1(y) ,w1(x)
Which is true?
S1 :Every non serial schedule between T1 and T2 are conflict serializable schedule
S2:some non serial schedule between T1 and T2 is conflict serializable schedule
S3 :some non serial schedule between T1 and T2 forms deadlock using 2PL
S4: some non serial schedule between T1 and T2 is allowed using 2PL
( can be more than one)