A customer has a SAS-based storage environment with a SAS domain and some standalone servers,
each with multiple built-in SAS disks. The implementation includes direct routing, table routing and
subtractive routing. Which role does a fanout expander play in subtractive routing?

A.
It routes between edge expanders connected to it.

B.
It forwards routing requests to all other connected edge expanders.

C.
It disables currently unused branches to increase throughput.

D.
It is the sole source of subtractive routing requests in the SAS domain.