Which of the following statements about the system services of the OceanStor 9000 are correct? (Select 2 answers)

Which of the following statements about the system services of the OceanStor 9000 are correct? (Select 2 answers)

A. The MDS service manages the metadata of a file system. B. The DS service stores file data but not metadata on the storage system. C. The CMS service manages physical nodes in a cluster. D. In an OceanStor 9000 storage system, some nodes provide the MDS service and some nodes provide the DS service.