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.