Which three statements are true about Automatic Workload Repository (AWR)?（）
- A All AWR tables belong to the SYSTEM schema.
- B The AWR data is stored in memory and in the database.
- C The snapshots collected by AWR are used by the self-tuning components in the database
- D AWR computes time model statistics based on time usage for activities, which are displayed in the v$SYS time model and V$SESS_TIME_MODEL views.
- E AWR contains system wide tracing and logging information.