254.Which three statements correctly describe the features of the I/O calibration process? (Choose three.)
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.
正确答案是ADE