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Which one of the following option does not follow deferred database modification scheme in the system crash situation?

 

1. After system crash if there is no ``commit T'' instruction in log file then it requires nothing to recover.

 

2. After a system crash, all transactions are redone in the backward order of their log record (i.e. last log record first).

 

3. No undo operations are required in the deferred database scheme.

 

4. None
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