Huawei V3 series storage system hardware includes controller enclosures and disk enclosures.
Which of the following statements about controller enclosures is correct?
A . When the external power supply fails, BBU modules provide backup power for all disks.
B . When the external power supply fails, BBUs can supply power to enable data synchronization from the cache to disks in disk enclosures.
C . If BBUs become faulty, the service system will be interrupted.
D . When the power input is normal, BBUs are in the standby state.
Answer: B