Which features and technologies ensure Ever Solid Dorado V6?

Which features and technologies ensure Ever Solid Dorado V6?
A . Cloud-level reliability: Gateway-free backup to the cloud
B . System-level reliability: The SmartMatrix fully-connected active-active architecture tolerates seven out of eight controllers to fail and one out of two controller enclosures to fail without interrupting services.
C . Data center-level reliability: HyperMetro-based gateway-free active-active and geo-redundant 3DC DR solutions
D . Disk-level reliability: Self-developed SSDs use wear and anti-wear leveling technologies to control the mean time between failures (MTBF)of SSDs in a more predictable manner.

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Answer: BCD