1. Consider the following log of the database after crash. There are five transactions in the log. Assume the database cache is used to disk before the Transaction_id Variable Before Image T1 A 15 25 35 T2 B 30 T1 Commit T1 End T3 50 60 T4 50 D 60 T3 Commit: T3 End: T5 Answer the following questions: a List the undo and redo transactions? [1 mark] b. What will be the value of A, B, C and D after the recovery process? [1 mark] c. Write the content of active table and commit table. [1 mark)