多选题

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？（）

AIt readily responds to dynamic changes for concurrent access.

BIt improves performance and space utilization in a multiple-instance environment.

CIt requires fewer space related options then freelist managed structures.

DIt improves performance for SYSTEM tablespaces where a high degree of concurrency is required.

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