5. T1: Begin Transaction Update R set Value Value + 1 where ID = 1; Update R set Value Value + 1 where ID=2; Update R set Value Value + 1

where ID = 3; Commit; T2: Select sum(Value) from R; Commit; Answer the following questions: a. If transactions execute with read-uncommitted, what is the possible distinct values of T2 b. (1pts) if transactions execute with read-committed, what is the possible distinct values of T2: c. (1pts) if transactions execute with repeatable-read, what is the possible distinct values of T2: d. (1pts) if transactions execute with serializable, what is the possible distinct values of T2: