The OceanStor 18000 System Used by a Client Business Application

The OceanStor 18000 system used by a client business application has a total of three pools, each of which is a 9-disk RAID5. Someday analyzing the log of business interruption, we found that there are some scenarios in the system that caused the failure. What will cause the host access to the stored business in the following scenario? (Multiple choice.)

A) In the fully redundant group environment, occurred the master reset.
B) With the BST (bad track) feature turned off, a BST bad track appears on the LUN.
C) The POOL where the business is located is all thin LUN and not a snapshot. LUN copy, clone and copy services are configured in the log POOL, which is a space full of print information.
D) Log in the following print: 2014-01-19 08:04:40} {Receive a disk-fault event of the disk (328) of pool (2) from ctrl.} 2014-01-19 08:40:35} {Receive a disk-fault event of the disk (613) of pool (3) from ctrl.}