The following is a sequence of undo-log records written by two transactions T and U: < START T >; < T, A, 10 >; < START U >; < U,B, 20 >; < T, C, 30 >; < U,D, 40 >; < COMMIT U >; < T, E, 50 >; < COMMIT T >. Describe the actions of the recovery manager, including changes to both disk and the log, if there is a crash and the last log record to appear on the disk is

1. (5 Points) < START U >

2. (5 Points) < T, E, 50 >

3. (5 Points) < COMMIT T >