An administrator is investigating several unexpected documents and video files that recently appeared in a...

An administrator is investigating several unexpected documents and video files that recently appeared in a network share. The administrator checks the properties of the files and sees the author's name on the documents is not a company employee. The administrator questions the other users, but no one knows anything about the files. The administrator then checks the log files and discovers the FTP protocol was used to copy the files to the server. Which of the following needs to be done to prevent this from happening again?