What is a design criteria of an EBS solution?

A.
The library is directly attached to a SAN connected backup server.

B.
Storage systems and libraries must be connected to different fabrics.

C.
Libraries are only supported in a Fibre Channel loop environment.

D.
The library is connected to the fabric via a Fibre Channel to SCSI router.

Explanation:
Are all hardware components at the minimum supported firmware revision, including:
Server, HBA, Fibre Channel Switch, Fibre Channel to SCSI Router, Interface Manager,
Command View TL, tape drives, library robot?