A is false.Huawei documentation shows that OceanProtect Backup Storage supportsdeduplication and compression for both LUNs and file systems, not only for LUNs. The file system creation parameters explicitly include dedup_enabled and compression_enabled, and Huawei's remote replication command reference also distinguishes both lun and file_system objects on supported models.

B is true, so it is not selected.Huawei's product highlights state that OceanProtect usesbackup data preprocessingandvariable-length deduplicationto improve logical capacity utilization and reduce TCO. That matches the statement.

C is false.Huawei states that OceanProtect uses a compression algorithm tocompress data blocks into smaller data blocks, and then combines and writes them into disks. So the statement is wrong because compression isnotsimply followed by direct disk writing ''without the need to perform any operations''; there is still a combining/write process after compression.

D is false.The statement mixes upfixed-lengthandcontent-definedchunking. For fixed-length deduplication, data is divided into blocks of afixed size, whereas Huawei's deduplication description emphasizesvariable-length deduplicationfor data reduction. Saying that fixed-length deduplication divides data into fixed-size blocksbased on contentis incorrect.