What is the minimum back-end storage capacity that Site A needs in spite of redundancy considerations?

The backup plan is calculated, site A required storage capacity of 3000GB, site B requires storage capacity of 1500GB. It is required that the backup data of Site B will be copied to Site A and saved at the same time. The deduplication ratio at the time of replication is 3.

What is the minimum back-end storage capacity that Site A needs in spite of redundancy considerations?
A . 4500GB
B . 3500GB
C . 2500GB
D . 1500GB

Answer: B