Which of the following RAID arrays should be used to achieve a fault tolerant array with at least 1TB of storage space?

Which of the following RAID arrays should be used to achieve a fault tolerant array with at least 1TB of storage space?

A.
Five 250GB drives in RAID 0

B.
Six 250GB drives in RAID 5

C.
Three 250GB drives in RAID 10

D.
Six 250GB drives in RAID 1