Client-server resources are Limited, but under the situation of adequate network bandwidth, it is necessary to back up client data to physical tape library, which deduplication strategy should be used?

Client-server resources are Limited, but under the situation of adequate network bandwidth, it is necessary to back up client data to physical tape library, which deduplication strategy should be used?
A . source side deduplication (backup software deduplication)
B . target side deduplication (backup software deduplication)
C . target side deduplication (backup software global deduplication)
D . target side deduplication (backup medium deduplication)

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Answer: D