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

A.
An advertising organization where multimedia files are backed up and store indefinitely
B.
Database environment where large transaction logs are backup up on a daily basis and for one
month
C.
Hospital environment where compliance requires patient information (CAT scans, MRI, x-rays)
to be backed up, stored, and accessible for up to 10 years
D.
Virtualized environment where OS images are stored in a SAN environment and backed up and
retained for 3-6 months