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

A.
Checking the HA Vault option prevents write cache from being disabled if an SP fails

B.
Unchecking the HA Vault option prevents write cache from being disabled if an SP fails

C.
Checking the HA Vault option prevents write cache from being disabled if disk 0,0,0 fails

D.
Unchecking the HA Vault option prevents write cache from being disabled if disk 0,0,1 fails