An administrative assistant is setting up a filing system for a new department that will handle client case files. Each client has a unique case number, but staff will most frequently need to access files based on the client's last name. Which filing system would be the most efficient for this department?
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A
A chronological system, filed by the date the case was opened.
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B
A numeric system, using the unique case number as the primary identifier.
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C
An alphabetic cross-reference system, where files are stored numerically but an alphabetic index is used to look up the corresponding case number.
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D
A subject-based system, with folders for different types of legal issues.