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Using a bitmap structure to manage database object space has several benefits over using freelist structures. Which three are benefits of managing space using automatic-segment-space managed objects？（）
A.It readily responds to dynamic changes for concurrent access.
B.It improves performance and space utilization in a multiple-instance environment.
C.It requires fewer space related options then freelist managed structures.
D.It improves performance for SYSTEM tablespaces where a high degree of concurrency is required.
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