Which description of the the OceanStor V3 file system snapshot feature is wrong?

A: In File System Snapshot when you create a snapshot, you simply copy the root of the file system and save it to form a snapshot of the file system. B: Deletion Snapshots use a mechanism for reclaiming space, so snapshot data space is immediately freed after snapshots have been deleted. C: After creating a snapshot in the File System, as the main file system is continuously updated, the original data block will gradually become the space occupied by this quick debt. However, a newly written data will not be included in the snapshot space. D: File system snapshot data can not be deleted directly, and only after the snapshot has been deleted, this part of the space can be released.