Explanation

4(a) Nature of content of file.
     - Organization method.
     - Storage medium.

4b(ii) Advantages of Computer Files

        - Fast to access
        - More secure   
        - More reliable
        - Less laborious

      
        Disadvantages of Computer Files
       - Irregular power supply
       - Data redundancy
       - Expensive to set up
       - Cannot guarantee queries
       - Can be destroyed by a virus.

4b (ii) COMPUTER ETHICS AND HUMAN ISSUES: SECURITY AND ETHICS
          - Use of back-ups
          - Password
          - Use of antivirus
          - Proper labeling of storage devices.

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