The Three Mainstream Storage Forms Are as Follows: 1)SAN Storage

The three mainstream storage forms are as follows: 1) SAN storage that provides block resources; 2) NAS storage that provides file system resources;3) object-based storage (OBS) . SAN storage and NAS storage are traditional storage forms. Which of the following statements about the characteristics of the three storage forms are correct? (Select three.)

A) In traditional storage forms, disks are partitioned, file systems record file structures based on a tree relationship, and metadata is used to identify the use of blocks.
B) Objects are the basic units of OBS. Each object is a composite of data and data property sets.
C) In the OBS mechanism, data and metadata are stored and managed in a distributed manner.
D) OBS is typically oriented to structured data applications.