5. (9 points)Consider the following log file of a database: 1) (3 points)When the system failure occurs after the Step 12(T4:Commit), how to recovery from the failure( which transaction should be redone, which transaction should be undone) 2) (3 points)Suppose we add a new checkpoint after the Step 12(T4:Commit). In this situation, the system failure occurs after the original Step 12(T4:Commit), how to recovery from the failure( which trans should be redo, which trans should be undo) 3) (3 points)Explain the advantages with checkpoint to recovery