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1.	Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â which increases the number of I/O operations needed to write a single logical block, pays a signiï¬cant time penalty in terms of write performance.
A.	raid level 1
B.	raid level 2
C.	raid level 5
D.	raid level 3
Answer» B. raid level 2

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