Which statement can be an inference from the output?（）

• A、The FRA disk group has an asynchronous I/O bottleneck
• B、The least number of I/Os are performed on the last data file in the list
• C、The number of times that the backup or restore process directed the OS to wait until an I/O was complete is the highest for the last data file in the list
• D、The number of times that the backup or restore process made an OS call to poll for I/O completion in Nonblocking mode is the least for the FRA disk group