An office manager needs to create a filing system for new client contracts. The contracts are frequently accessed by the client's last name. The office anticipates a high volume of new clients over the next several years. Which filing system would be the MOST efficient and scalable for this purpose?
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A
A chronological system, filing contracts by the date they were signed.
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B
A subject-based system, with folders for different types of services rendered.
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C
An alphabetical system, filing contracts directly by the client's last name.
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D
A numeric system, where each client is assigned a unique number and an alphabetical cross-reference index is maintained.