(Solved): The following is a sequence of undo/redo-log records writ ten by two transactions T and U: <STA ...

The following is a sequence of undo/redo-log records writ­ ten by two transactions T and U: <START T>; <T, A, 10,11>; <START U>; <U, B, 20,21>; <T, (7,30,31>; <U,D, 40,41>; <C0MMIT U>; <T,E, 50,51>; <C0MMIT T>. Describe the action 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 disk is:

1. <START U>
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2. <COMMIT U>
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3. <T, E, 50, 51>
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4. <COMMIT T>
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1.  
2. <COMMIT T>