The OceanStor 9000 allows users to define file pool polices based on file attributes and I/O frequency. Which of the following statements about file pool polices are correct? (Select three.)

A create policy is used to determine the initial location where a newly created file is to be stored. Such a policy includes the following items:file storage path, file name, and UID/GID. 

A relocate policy is used to determine the target location where a file is to be migrated. 

A delete policy is used to determine when to delete a file from the system. 

A modify policy is used to determine how to modify a file.