If Data Domain is a target for backups, which environment will yield the highest deduplication compression ratio?

A.
Hospital where compliance requires patient information (CAT scans, MRI, X-Rays) to be backed up and archived for 10 years
B.
Virtualized environment where OS images are stored in a SAN environment backed up and stored for up to 3-6 months
C.
Financial institution where compliance requires e-mails and documents are backed up and stored for up to 7 years
D.
Database environment where transaction logs are backed up daily and stored for 1 month
I would go for C.
The retention period is way higher, and e-mails and docs have a decent deduplication ratio (unlike the cat scans/mri/x-ray)
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