A server hardware technician installs an external DLT (Digital Linear Tape) drive. During the boot process, the device is not recognized by the SCSI controller. Which two steps should be taken to troubleshoot the problem? (Select TWO)

A.
make sure that the DLT (Digital Linear Tape) drive has power

B.
verify that the controller is recognized by the operating system

C.
verify that the device drivers have been loaded

D.
verify the cabling is connected securely and is the proper type