单选题：Suppose we have a disk cluster with 8 equal-size disks. And we c

Suppose we have a disk cluster with 8 equal-size disks. And we can select raid 0, raid 1 or raid 5 for the cluster.
Which of the following lists memory types from highest to lowest speed?@[D](1)
A. secondary storage, main memory, L2 cache, registers
B. registers, L1 cache, secondary storage, main memory.
C. L1 cache, registers, main memory, secondary storage
D. registers, L2 cache, main memory, secondary storage




A.secondary storage, main memory, L2 cache, registers
B.registers, L1 cache, secondary storage, main memory.
C.L1 cache, registers, main memory, secondary storage
D.registers, L2 cache, main memory, secondary storage


答案：D