In your production database， you observe that users’ transactions are consuming a lot of resources and you plan to impose resource restrictions by using Resource Manager. For which three resources can you enable usage restrictions by using Resource Manager？ （）

• A、CPU usage
• B、degree of parallelism
• C、number of open cursors
• D、number of sorts performed
• E、idle time for blocking sessions
• F、number of disk I/O operations performed
• G、number of memory I/O operations performed