What supports the Easy Tier function for an S822?

A.
(8) drives with a split backplane
B.
(12) drives with a split backplane
C.
(8) drives with a second SAS controller
D.
(12) drives without split backplane
Explanation:
http://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=an&subtype=ca&appname=gpateam&supplier=897&letternum=ENUS114-061