You Have a Server with Four SCSI Disks

You have a server with four SCSI disks.You have just installed a fifth SCSI disk into the server. After a reboot of the system,your disk controller only recognizes three of the five disks. What is a likely cause of the problem?

A) the fifth disk is the identical size and brand of one of the other disks, causing a conflict
B) the new disk is dead and one of the existing disks also died
C) the new disk's address conflicts with one of the other disk's address
D) SCSI can only support four disks and the fifth disk is causing the fourth disk to not work properly