is this schedule strict?

R1( X ); R2( X ); W2( X ); W1( X ); T2:COMMIT; T1:COMMIT

a. serializable and strict

b. serializible and not strict

c. not serializable and strict

c. not serializable and not strict

shivani @shivani1234
4 Oct 2017 10:29 am

It is neither serializable nor strict , since there is cycle and there is write by T1 after T2 before T2 commits.
"A schedule is called strict if every value written by a transaction T is not read or changed by other transactions until T either aborts or commits."