In a data center environment, what is an advantage of using parity-based RAID protection over mirroring?

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In a data center environment, what is an advantage of using parity-based RAID protection over mirroring?
A . Reduces the storage capacity required to protect the data
B. Eliminates the write penalty for improving the performance
C. Improves the efficiency of logical disk drives in the RAID set
D. Increases the performance of small write I/O operation

Answer: A