Which is correct about traditional RAID? (Multiple Choice)

There are two statements about backups below, which is correct?
Statement 1: The retention period refers to the time it takes to backup.
Statement 2: Incremental backup takes the longest time among the three backup types.

When an engineer understands the local write process of the storage system, he believes that the host first writes the IO request to a certain controller engine, and then the engine writes the value directly to the engine's local hard disk.

After the all-flash device (for example: Huawei Oceanstor) is configured for remote replication, the slave lun can be set to the p-writable state, which can be done before the master-slave switchover or after the master-slave switchover.

When CIFS share permissions are assigned, if a user lives in a different user group, and for a share, the CIFS share grants different permissions to the user group and the user, and the user's permissions are the maximum authority of the user group and user permissions of the user.