What Is Correct About the Reconstruction of the Huawei OceanStor

Multiple Choice

What is correct about the reconstruction of the Huawei OceanStor V3 storage system? (Multiple choice.)

A) It can quickly recover valid data, not updated data does not need to be restored.
B) Complete reconstruction requires data difference log information.
C) Recovery Refactoring uses a scenario where the disk can not be used for downgrade.
D) In the event of a sudden disk failure recovery reconstruction.