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Hierarchical Storage Management (HSM) is commonly employed in:
Correct Answer: A
Explanation/Reference: Explanation: HSM (Hierarchical Storage Management) provides continuous online backup functionality. It combines hard disk technology with the cheaper and slower optical or tape jukeboxes. HSM is typically used in very large data retrieval systems. Incorrect Answers: B: HSM is typically not used in small data retrieval systems. C: HSM is not used in small data retrieval systems. D: Due to the added complexity of HSM, it is used only in very large data retrieval systems. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 1274