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If you want to deploy the most space efficient recovery technique, which of the following would you use?
Differential
Incremental
Both A and B
Full
I suggest you look again at this question. The most efficient recovery technique is implying restoring data. In terms of the number of tapes you would have to apply to restore the data, The full backup tape would be the easiest (1 tape) to recover followed by the full with differential (2 tapes) followed by the incremental ( Unknown number of tapes but likely more than differential)
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