Use all of the information provided to develop a domain model class diagram.

The basic operation of the Remote Imaging Viewer is as follows: When started, the Network Connection Unit verifies that is has the appropriate network parameters for communication. The results (valid / not-valid) are passed to the Control Unit via Status. If not-valid, a Status Message is passed to the Image Display Unit, indicating the type of network problem. If valid, a Status Message is passed to the Display Unit requesting the Username and Password. When these are supplied they are sent to the User Unit, which uses Command and Data to pass the Username and Password to the Remote Server. Upon authentication the Remote Server passes a verified / not-verified status back via Data to the User Unit. The Image Display Unit is used to indicate the results of the authentication. If not verified, the username / password process repeats. If verified, the File Access Unit then obtains the File Path for the desired image file and passes this information to the Remote Server. If the file is not found, a status message is passed back and the Image Display Unit reports the error message. If the file is found, a decryption key is sent back first and passed to the Cryptography Unit. Then the file is sent (encrypted) to the File Access Unit and stored as File. The Cryptography Unit then decrypts the File and passes it to the Image Display Unit for viewing. The Image Manipulation Unit is given control so any changes can be made while viewing. If a new version of the file must be uploaded, the Cryptography Unit is engaged, the file is encrypted, and passed to the File Access Unit for uploading via the Remote Server connection.

Here is what I have come up with so far. I need verification if my design is correct.

RemoteServer send authentication results / pass login info pAddressDomainName 1port command data NetworkConnectionUnit UserUnit ipAddress subnetMask defaultGateway dnsAddress status username password command data CryptographyUnit key FileAccessUnit login results displayed / send entered login info passes status filePath fileSize status ImageDisplayUnit File Control 1 width height colors compression statusMessage namie size data status M2 M1 M4 M3 ImageManipulationUnit width height colors compression imageOperation