A user states that when the user copies files from ‘My Documents’ to a network share, the files are no longer available locally. Which of the following BEST describes the reason the files are no longer visible?（）

• A、The user copied to a read-only folder share.
• B、The user changed the attributes of the files.
• C、The user copied the files from the local My Documents folder.
• D、The user moved instead of copied the files.