You work as a database administrator at Certkiller .com. In your production database， you observe that users’ transactions are consuming a lot of resource 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