Huawei's hyper-converged storage uses a distributed storage logic architecture. Which of the following is the function of the MDC module?

Among Huawei's many disaster recovery solutions, which of the following scenarios can eReplication be used? (Multiple choices)

An enterprise administrator created a shared folder on the root directory of the file system, and created 3 different Quota Trees under the root directory for Manager A (Quota Tree 1), Project Department B (Quota Tree 2) and Sales Department C (Quota Tree 3) is used alone. Which of the following statement is correct?

If a disk in an OceanStor 9000 stays offline for 15 minutes, the system obtains the data on the disk through calculations and then writes the data to other functional disks.

A customer purchases nine OceanStor 9000 storage nodes. During the deployment planning, the customer requires that data integrity be not affected if any three disks in a storage node are faulty, and the overall storage space utilization be not lower than 80%.
Which of the following is the most proper redundancy ratio?