You work as a database administrator for Supportcenter.cn. You have set the retention period for Automatic Repository （AWR） statistics to four days and collection interval to 15 minutes. You want to view the statistics collected and stored in AWR snapshot. Which two methods would you use to view the AWR statistics？（）

• A、use enterprise manager
• B、use DBMS_SQL package
• C、use DBMS_AWR package
• D、use PRVT_WORKLOAD package
• E、query the AWR snapshot repository objects
• F、use DBMS_WORKLOAD_REPOSITORY package