Recovering a Database Via Rollback Involves

Recovering a database via rollback involves:

A) restoring the database from the save and reprocessing all the transactions since the save.
B) restoring the database from the save and reapplying all the changes made by transactions since the save.
C) undoing the changes made by erroneous or partially processed transactions and restarting the valid transactions that were in process at the time of the failure.
D) re-creating the database by re-entering all of the data from the beginning and,then reprocessing all of the transactions.
E) synchronizing the database and the transaction log by checkpointing.