单选题：RAID level 2 schemes _______.

RAID level 2 schemes _______.@[D](1)
A. offer higher throughput than RAID level 0
B. are more space-efficient than RAID level 1
C. are rarely implemented
D. both B and C




A.offer higher throughput than RAID level 0
B.are more space-efficient than RAID level 1
C.are rarely implemented
D.both B and C


答案：D