You work as a database administrator for Supportcenter.cn. You find that reports are running for a long time in your data warehousing applications. You suspect a lack of indexes is the reason for the performance degradation. Which advisory component would you refer to， in order to determine the appropriate indexes？（）
- AMemory Advisors
- BSegment Advisors
- CSQL Tuning and Access Advisors
- DAutomated Workload Repository （AWR）
- EAutomatic Database Diagnostic Monitor （ADDM）