An administrator suspects problems on a SCSI hard disk，but upon running diagnostics，no errors were found. What must be done to check the condition of the drive？（）

• A、Run diag and select the ‘Certify Media’ task.
• B、Perform a read and write test on the disk and monitor errorlog.
• C、Update the disk firmware to the latest level and monitor errorlog.
• D、Format the disk to ensure bad blocks are omitted from the disk layout.