Which environment will yield the optimal data deduplication for backup purposes?

A.
Hospital environment where compliance requires patient information (CAT scans,
MRI, x-rays) to be backed up, stored, and accessible for up to 10 years

B.
Database environment where large transaction logs are backup up on a daily basis
and for one month

C.
An advertising organization where multimedia files are backed up and store
indefinitely

D.
Virtualized environment where OS images are stored in a SAN environment and
backed up and retained for 3-6 months