Which feature is unique to the EVA8400 / 11GB cache (per controller) model when compared to other EV

Which feature is unique to the EVA8400 / 11GB cache (per controller) model when compared to
other EVA array models?

A.
400TB addressable storage space

B.
use of a third cache battery

C.
up to 5GB policy memory

D.
maximum of 27 device shelves