During routine maintenance on your server, you discover that one of the hard drives on your RAID array is starting to go bad. After you replace the drive and rebuild the data, you run diagnostics on the RAID controller card with no problems, so you believe you fixed the problem. The next morning you arrive at work and discover that the RAID has completely failed. None of the disks are working. Your server is still running because you installed the OS on a non$-$RAID disk, but all the data is missing, and the server shows that none of your RAID disks are found. What might be the problem with your server? $($Select all that apply.$)$

a$.$

RAID controller

b$.$

RAM

c$.$

CPU

d$.$

Power supply

e$.$

Motherboard