A customer has reported degraded performance with several of the applications that run on a VNX. After going through the performance data on the array, you find that all the performance issues are centered around the same RAID 6 group, and that the RAID group is supplying 50 percent less IOPS than before.

What is the most likely reason?

A.
The RAID group is being rebuilt.

B.
The RAID group is trespassed.

C.
Write cache is not configured.

D.
The RAID group is being defragmented.