Which SPS test method do CLARiiON systems use to avoid a situation in which write cache may be disab

Which SPS test method do CLARiiON systems use to avoid a situation in which write cache may be disabled for extended periods of time?

A.
SPS test times are staggered

B.
SPS units are tested simultaneously

C.
SPS units are tested only on power-up

D.
Each SPS is tested on alternate weeks