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

A.
Database environment where large transaction logs are backed up on a daily basis
and stored for one month

B.
An advertising organization where multimedia files are backed up and stored
indefinitely

C.
Virtualized environment where O/S images are stored in a SAN environment and
backed up and retained for 3-6 months

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