Which NetApp Storage Tier component works controller-wide on a FAS controller?

A.
Flash Pool

B.
Flash Disk

C.
Flash Accel

D.
Flash Cache

E.
Flash IO

Explanation:
http://www.netapp.com/us/system/pdf-reader.aspx?m=ds-3177-0512.pdf&cc=us
http://www.netapp.com/us/products/storage-systems/flash-cache/index.aspx?ref_source=ntp141p359372brg-c-
26967a63-442e-c7e9-6a73-00002efa4dd6&gclid=CLLdsqWKrbkCFS4aOgodb1AAuA
Flash Cache is a controller-attached PCIe intelligent caching solution.
Flash Accel is a host-attached caching solution.
Flash Pool utilizes SSDs to enhance performance of disk aggregates (implicitly not controller-wide).
Flash Disk and Flash IO are ambiguous terms.