Linux Extended Attributes include attribute classes. Which of the following are included in the defined attribute classes? (Select THREE correct answers)

`default` is not an attribute class for extended attributes; it refers to a type of ACL entry used on directories.

The `system` attribute class is a predefined namespace for extended attributes that store system-specific metadata, often managed by the kernel or core utilities.

`owner` is a standard file metadata (user ID of the owner) and not one of the extended attribute classes.

The `trusted` attribute class is a predefined namespace for extended attributes that can only be accessed or modified by privileged processes, such as the root user.

The `user` attribute class is a predefined namespace for extended attributes that allows regular users to store and retrieve arbitrary metadata on files.