3. þ B. Flashback is only approximate; redo is needed to reach the precise
point required—so B is correct.
ý A, C, and D. A is wrong because redo can never be used to reverse
changes, only to redo them. C is wrong because the flashback data is written
by the RVWR process, not by the archiver processes. D is wrong because
archivelog mode is necessary.
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