For this controller failure, which of the following description are correct?

OceanStor V3 dual-controller failure, unable to start the controller serial print "Grub err xx" (general is 24 or 17), after waiting for a long time still cannot repair automatically.

For this controller failure, which of the following description are correct? (Multiple choice)
A . Controller on the Flash card small probability of file system corruption case, lead to Grub errors in electricity, electricity failure.
B . Controller start safe disk failure, lead to Grub errors in electricity, electricity failure.
C . Unable to start the controller serial print "Grub err xx" (general is 24 or 17), after waiting for a long time still cannot repair automatically.
D . None of the same type as the same version of OceanStorV3 storage, you need to apply at least one controller, two hard drives to build a new environmental recovery.

Answer: ACD