A customer is currently running a 1 x 2 Avamar server with 1 TB nodes. In order to add new clients to their Avamar environment, the customer needs more capacity.
How can this be achieved?

A.
Migrate the backup data to a new 1 x 4 server using root-to-root replication

B.
Add one, 2 TB node to the 1 x 2 infrastructure with RAIN enabled

C.
Add one, 1 TB node to the existing Avamar server with RAIN enabled

D.
Upgrade the current Avamar 1 TB license to a 2 TB license