Which three statements correctly describe the features of the I/O calibration process？（）
- A Only one I/O calibration process can run at a time
- B It automates the resource allocation for the Automated Maintenance Tasks
- C It improves the performance of the performance-critical sessions while running
- D It can be used to estimate the maximum number of I/Os and maximum latency time for the system
- E The latency time is computed only when the TIMED_STATISTICS initialization parameter is set to TRUE