An administrator notices the RAID 5 array is reporting a degraded health message. It contains three HDDs. A technician replaces the faulty HDD with a new one, but users then report access to the fileshare is not as fast as it used to be.
Which of the following is MOST likely preventing the RAID array from operating optimally?
A . The mirrored set is broken
B . Write caching has been turned on
C . The wrong drive was replaced
D . The RAID array is rebuilding
Answer: D