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4.What is a physical file?
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(a) A file viewed in terms of how data is stored on a storage media and how processing operations are done.
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(b) A file viewed in terms of what data items it contains and details of what processing operations may be performed on the data items.
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(c) A file viewed in terms of all information that can be retrieved one at a time.
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(d) A file whose contents are physical to the viewer
