About B: with dbms_workload_repository.create_snapshot, you can specify a parameter flush_level with a possible value of 'TYPICAL' (default), and 'ALL').
C is incorrect -> By default, the Automatic Workload Repository (AWR) generates snapshots of performance data once every hour, and retains the statistics in the workload repository for 8 days. https://docs.oracle.com/en/database/oracle/oracle-database/19/tdppt/automatic-database-performance-monitoring.html#GUID-8FFE01C9-57C9-4A5B-A410-108E99319DA0
The question is good corrected. -> ABD
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